U.S. patent application number 13/098272 was filed with the patent office on 2011-12-08 for reaction products and methods for making and using the same.
Invention is credited to Mary L. Epling, Kurt D. Gabrielson.
Application Number | 20110296886 13/098272 |
Document ID | / |
Family ID | 44861941 |
Filed Date | 2011-12-08 |
United States Patent
Application |
20110296886 |
Kind Code |
A1 |
Gabrielson; Kurt D. ; et
al. |
December 8, 2011 |
REACTION PRODUCTS AND METHODS FOR MAKING AND USING THE SAME
Abstract
Reaction products and methods for making and using the same are
provided. In at least one specific embodiment, the fertilizer can
include a nitrogen source comprising urea, ammonia, ammonium
nitrate, or any combination thereof and a reaction product of
formaldehyde, an ammonia source, and a nitrification inhibitor.
Inventors: |
Gabrielson; Kurt D.;
(Lilburn, GA) ; Epling; Mary L.; (Conyers,
GA) |
Family ID: |
44861941 |
Appl. No.: |
13/098272 |
Filed: |
April 29, 2011 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
61329680 |
Apr 30, 2010 |
|
|
|
Current U.S.
Class: |
71/29 ; 71/27;
71/28; 71/30 |
Current CPC
Class: |
C05G 3/90 20200201; C05C
9/00 20130101; Y02P 60/21 20151101; C05C 9/02 20130101; C05C 3/00
20130101 |
Class at
Publication: |
71/29 ; 71/27;
71/28; 71/30 |
International
Class: |
C05C 9/00 20060101
C05C009/00; C05C 3/00 20060101 C05C003/00; C05C 1/00 20060101
C05C001/00 |
Claims
1. A fertilizer, comprising: a nitrogen source comprising urea,
ammonia, ammonium nitrate, or any combination thereof; and a
reaction product of formaldehyde, an ammonia source, and a
nitrification inhibitor.
2. The fertilizer of claim 1, wherein the nitrification inhibitor
comprises 2-chloro-6-trichloromethyl-pyridine,
5-ethoxy-3-trichloromethyl-1,2,4-thiadiazol, dicyandiamide,
2-amino-4-chloro-6-methyl-pyrimidine, 1,3-benzothyiazole-2-thiol,
4-amino-N-1,3-thiazol-2-ylbenzenesulfonamide, thiourea; guanidine,
3,4-dimethylpyrazole phosphate,
2,4-diamino-6-trichloromethyl-5-triazine, polyetherionophores,
4-amino-1,2,4-triazole, 3-mercapto-1,2,4-triazole, potassium azide,
carbon bisulfide, sodium trithiocarbonate, ammonium
dithiocarbamate, 2,3, dihydro-2,2-dimethyl-7-benzofuranol
methyl-carbamate, N-(2,6-dimethylphenyl)-N-(methoxyacetyl)-alanine
methyl ester, ammonium thiosulfate, 1-hydroxypyrazole,
2-methylpyrazole-1-carboxamide, derivatives thereof, and any
combination thereof.
3. The fertilizer of claim 1, wherein a molar ratio of the
formaldehyde to ammonia in the reaction product ranges from about
3:1 to about 9:1 and a molar ratio of the formaldehyde to
nitrification inhibitor in the reaction product ranges from about
1:1 to about 3:1.
4. The fertilizer of claim 1, wherein reacting the formaldehyde,
ammonia source, and nitrification inhibitor comprises: combining
the formaldehyde and the nitrification inhibitor at a molar ratio
from about 1:1 to about 3:1 to produce a first mixture; heating the
first mixture to a temperature ranging from about 50.degree. C. to
about 80.degree. C.; introducing ammonium chloride to the first
mixture to produce a second mixture, wherein the total amount of
ammonium chloride introduced to the first mixture provides a
formaldehyde to ammonia molar ratio ranging from about 3:1 to about
9:1; heating the second mixture to a temperature ranging from about
70.degree. C. to about 90.degree. C.; and cooling the second
mixture to produce the reaction product.
5. The fertilizer of claim 1, wherein the reaction product
comprises from about 30 mol % to about 70 mol % formaldehyde, from
about 5 mol % to about 25 mol % ammonia, and from about 15 mol % to
about 45 mol % nitrification inhibitor, based on a total weight of
the formaldehyde, the ammonia, and the nitrification inhibitor.
6. The fertilizer of claim 1, wherein a molar ratio of the
formaldehyde to ammonia in the reaction product ranges from about
1:1 to about 8:1 and a molar ratio of the formaldehyde to
nitrification inhibitor in the reaction product ranges from about
1:1 to about 7:1.
7. The fertilizer of claim 1, wherein the reaction product is
produced by reacting the formaldehyde, ammonia source, and
nitrification inhibitor in water under alkaline reaction conditions
to yield an aqueous reaction product.
8. The fertilizer of claim 1, wherein the ammonia source comprises
one or more ammonium salts, aqueous ammonia, anhydrous ammonia, or
any combination thereof.
9. The fertilizer of claim 1, wherein a concentration of the
reaction product in the fertilizer ranges from about 0.1 wt % to
about 20 wt %, based on a total amount of nitrogen in the nitrogen
source.
10. The fertilizer of claim 1, wherein a concentration of the
reaction product in the fertilizer ranges from about 1 wt % to
about 15 wt %, based on a total amount of nitrogen in the nitrogen
source.
11. The fertilizer of claim 1, wherein the reaction product further
comprises a urease inhibitor reacted with the formaldehyde, ammonia
source, and nitrification inhibitor, and wherein the urease
inhibitor comprises N-(n-butyl)thiophosphoric triamide,
N-(n-butly)phosphoric triamide, thiophosphoryl triamide, phenyl
phosphorodiamidate, cyclohexyl phosphoric triamide, cyclohexyl
thiophosphoric triamide, phosphoric triamide, hydroquinone,
p-benzoquinone, hexamidocyclotriphosphazene, thiopyridines,
thiopyrimidines, thiopyridine-N-oxides,
N,N-dihalo-2-imidazolidinone, N-halo-2-oxazolidinone, derivatives
thereof, or any combination thereof.
12. The fertilizer of claim 1, further comprising one or more
urease inhibitors.
13. The fertilizer of claim 1, wherein the reaction product further
comprises urea reacted with the formaldehyde, ammonia source, and
nitrification inhibitor.
14. The fertilizer of claim 1, wherein the nitrogen source
comprises anhydrous ammonia.
15. A method for making a fertilizer, comprising: reacting
formaldehyde, an ammonia source, and a nitrification inhibitor
under conditions sufficient to produce a reaction product; and
combining the reaction product with a nitrogen source to produce a
fertilizer, wherein the nitrogen source comprises urea, ammonia,
ammonium nitrate, or any combination thereof.
16. The method of claim 15, further comprising reacting at least
one of urea and a urease inhibitor with the formaldehyde, ammonia
source, and nitrification inhibitor to produce the reaction
product.
17. The method of claim 15, wherein the nitrification inhibitor
comprises 2-chloro-6-trichloromethyl-pyridine;
5-ethoxy-3-trichloromethyl-1,2,4-thiadiazol; dicyandiamide;
2-amino-4-chloro-6-methyl-pyrimidine; 1,3-benzothiazole-2-thiol;
4-amino-N-1,3-thiazol-2-ylbenzenesulfonamide; thiourea; guanidine;
3,4-dimethylpyrazole phosphate;
2,4-diamino-6-trichloromethyl-5-triazine; polyetherionophores;
4-amino-1,2,4-triazole; 3-mercapto-1,2,4-triazole; potassium azide;
carbon bisulfide; sodium trithiocarbonate; ammonium
dithiocarbamate; 2,3, dihydro-2,2-dimethyl-7-benzofuranol
methyl-carbamate; N-(2,6-dimethylphenyl)-N-(methoxyacetyl)-alanine
methyl ester; ammonium thiosulfate; 1-hydroxypyrazole;
2-methylpyrazole-1-carboxamide; derivatives thereof, or any
combination thereof.
18. The method of claim 15, wherein an amount of the reaction
product in the fertilizer ranges from about 0.5 wt % to about 20 wt
%, based on a total amount of nitrogen in the nitrogen source.
19. The method of claim 15, wherein the nitrogen source is disposed
within a soil and the reaction product is combined with the
nitrogen source within the soil.
20. The method of claim 15, wherein a molar ratio of the
formaldehyde to ammonia in the reaction product ranges from about
3:1 to about 9:1 and a molar ratio of the formaldehyde to
nitrification inhibitor in the reaction product ranges from about
1:1 to about 3:1.
21. The method of claim 15, wherein reacting the formaldehyde,
ammonia source, and nitrification inhibitor comprises: combining
the formaldehyde and the nitrification inhibitor at a molar ratio
from about 1:1 to about 3:1 to produce a first mixture; heating the
first mixture to a temperature ranging from about 50.degree. C. to
about 80.degree. C.; introducing ammonium chloride to the first
mixture to produce a second mixture, wherein the total amount of
ammonium chloride introduced to the first mixture provides a
formaldehyde to ammonia molar ratio ranging from about 3:1 to about
9:1; heating the second mixture to a temperature ranging from about
70.degree. C. to about 90.degree. C.; and cooling the second
mixture to produce the reaction product.
22. The method of claim 15, wherein the reaction product comprises
from about 30 mol % to about 70 mol % formaldehyde, from about 5
mol % to about 25 mol % ammonia, and from about 15 mol % to about
45 mol % nitrification inhibitor, based on a total weight of the
formaldehyde, the ammonia, and the nitrification inhibitor.
23. The method of claim 15, wherein a molar ratio of the
formaldehyde to ammonia in the reaction product ranges from about
1:1 to about 8:1 and a molar ratio of the formaldehyde to
nitrification inhibitor in the reaction product ranges from about
1:1 to about 7:1.
24. The method of claim 15, wherein the reaction product is
produced by reacting the formaldehyde, ammonia source, and
nitrification inhibitor in water under alkaline reaction conditions
to yield an aqueous reaction product.
25. The method of claim 15, wherein the ammonia source comprises
one or more ammonium salts, aqueous ammonia, anhydrous ammonia, or
any combination thereof.
26. The method of claim 15, wherein a concentration of the reaction
product in the fertilizer ranges from about 0.1 wt % to about 20 wt
%, based on a total amount of nitrogen in the nitrogen source.
27. The method of claim 15, wherein a concentration of the reaction
product in the fertilizer ranges from about 1 wt % to about 15 wt
%, based on a total amount of nitrogen in the nitrogen source.
28. The method of claim 15, wherein the reaction product further
comprises a urease inhibitor reacted with the formaldehyde, ammonia
source, and nitrification inhibitor, and wherein the urease
inhibitor comprises N-(n-butyl)thiophosphoric triamide,
N-(n-butly)phosphoric triamide, thiophosphoryl triamide, phenyl
phosphorodiamidate, cyclohexyl phosphoric triamide, cyclohexyl
thiophosphoric triamide, phosphoric triamide, hydroquinone,
p-benzoquinone, hexamidocyclotriphosphazene, thiopyridines,
thiopyrimidines, thiopyridine-N-oxides,
N,N-dihalo-2-imidazolidinone, N-halo-2-oxazolidinone, derivatives
thereof, or any combination thereof.
29. The method of claim 15, further comprising combining one or
more urease inhibitors with the reaction product and the nitrogen
source.
30. The method of claim 15, wherein the nitrogen source comprises
anhydrous ammonia.
31. A method for reducing nitrification in soil, comprising:
reacting formaldehyde, an ammonia source, and a nitrification
inhibitor under conditions sufficient to produce a reaction
product; applying the reaction product to a soil.
32. The method of claim 31, wherein one or more nitrogen sources is
disposed within the soil and the reaction product is combined with
the one or more nitrogen sources within the soil.
33. The method of claim 32, wherein the one or more nitrogen
sources comprise urea, ammonia, ammonium nitrate, or any
combination thereof.
34. The method of claim 31, further comprising disposing one or
more nitrogen sources on the soil, within the soil, or both,
wherein the one or more nitrogen sources comprise animal manure,
animal urine, or a combination thereof.
35. The method of claim 34, wherein the reaction product is applied
to the soil after the one or more nitrogen sources, before the one
or more nitrogen sources, or both.
36. The method of claim 31, wherein the amount of reaction product
applied to the soil ranges from about 1 kg/ha to about 50
kg/ha.
37. The method of claim 32, wherein an amount of the reaction
product applied to the soil ranges from about 1 wt % to about 25 wt
%, based on a total amount of nitrogen in the one or more nitrogen
sources.
38. The method of claim 31, further comprising reacting urea with
the formaldehyde, ammonia source, and nitrification inhibitor to
produce the reaction product.
39. The method of claim 31, further comprising reacting a urease
inhibitor with the formaldehyde, ammonia source, and nitrification
inhibitor, and wherein the urease inhibitor comprises
N-(n-butyl)thiophosphoric triamide, N-(n-butly)phosphoric triamide,
thiophosphoryl triamide, phenyl phosphorodiamidate, cyclohexyl
phosphoric triamide, cyclohexyl thiophosphoric triamide, phosphoric
triamide, hydroquinone, p-benzoquinone,
hexamidocyclotriphosphazene, thiopyridines, thiopyrimidines,
thiopyridine-N-oxides, N,N-dihalo-2-imidazolidinone,
N-halo-2-oxazolidinone, derivatives thereof, or any combination
thereof.
40. The method of claim 31, further comprising combining a urease
inhibitor with the reaction product.
Description
CROSS-REFERENCES TO RELATED APPLICATIONS
[0001] This application claims priority to U.S. Provisional Patent
Application having Ser. No. 61/329,680, filed Apr. 30, 2010, which
is incorporated by reference herein.
BACKGROUND OF THE INVENTION
[0002] 1. Field
[0003] Embodiments described herein generally relate to
fertilizers. More particularly, such embodiments relate to reaction
products that provide an extended period of nitrification
inhibition and methods for making and using the same.
[0004] 2. Description of the Related Art
[0005] Fertilizers typically include urea, ammonia, ammonium
nitrate, or a mixture thereof to provide a source of nitrogen.
Nitrogen is a vital nutrient for plant growth. When urea is used as
a source of nitrogen in the fertilizer, the urea converts to
ammonia as a result of hydrolysis catalyzed by urease, which is an
enzyme produced by numerous fungi and bacteria found in the soil.
Ammonia rapidly undergoes ionization in the soil to form ammonium.
In most soils, the resulting ammonium and the ammonium nitrate, if
present, are readily oxidized to nitrate (NO.sub.3) via a sequence
of bacterial oxidation reactions, which is commonly referred to as
"nitrification." Nitrification of the ammonium, however, happens so
fast that a large percentage of the nitrogen in the fertilizer is
lost before the plants can utilize it.
[0006] Nitrogen is also lost from the soil through volatilization
to the atmosphere. Nitrate, another source of nitrogen, is
typically lost through leaching into the subsoil by rainwater
and/or through denitrification, i.e., bacterial conversion of
nitrate to elemental nitrogen.
[0007] Attempts to reduce such losses of nitrogen have utilized
urease inhibitors and/or nitrification inhibitors as additives to
the fertilizer. Urease inhibitors are compounds capable of
inhibiting the catalytic activity of the urease enzyme on urea in
the soil. Nitrification inhibitors are compounds capable of
inhibiting the bacterial oxidation of ammonium to nitrate in the
soil. Nitrification inhibitors, however, tend to leach into the
soil, away from the plant, thus becoming ineffective at inhibiting
nitrification where it is needed--near the plant.
[0008] There is a need, therefore, for improved fertilizers that
provide an extended period of nitrification inhibition and methods
for making and using the same. There is also a need for improved
products that reduce nitrification in soil and methods for making
and using the same.
SUMMARY OF THE INVENTION
[0009] In at least one specific embodiment, the fertilizer can
include a nitrogen source comprising urea, ammonia, ammonium
nitrate, or any combination thereof and a reaction product of
formaldehyde, an ammonia source, and a nitrification inhibitor.
[0010] In at least one other specific embodiment, the fertilizer
can include a nitrogen source comprising urea, ammonia, ammonium
nitrate, or any combination thereof and a reaction product of
formaldehyde, urea, an ammonia source, and a nitrification
inhibitor.
[0011] In at least one specific embodiment, the method for making
the fertilizer can include reacting formaldehyde, an ammonia
source, and a nitrification inhibitor under conditions sufficient
to produce a reaction product. The reaction product can be combined
with a nitrogen source to produce the fertilizer. The nitrogen
source can include, but is not limited to, urea, ammonia, ammonium
nitrate, or any combination thereof.
[0012] In at least one specific embodiment, the method for reducing
nitrification in soil can include reacting formaldehyde, an ammonia
source, and a nitrification inhibitor under conditions sufficient
to produce a reaction product. The reaction product can be applied
to a soil.
DETAILED DESCRIPTION OF THE INVENTION
[0013] The fertilizer can be or include a mixture of one or more
nitrogen sources and a reaction product of any three or more of the
following: formaldehyde, an ammonia source, a nitrification
inhibitor, urea, and a urease inhibitor. For example, the
fertilizer can be or include a mixture of one or more nitrogen
sources and a reaction product of formaldehyde, an ammonia source,
and a nitrification inhibitor. The fertilizer can also be or
include a mixture of one or more nitrogen sources and a reaction
product of formaldehyde, an ammonia source, a nitrification
inhibitor and urea. The fertilizer can also be or include a mixture
of one or more nitrogen sources and a reaction product of
formaldehyde, an ammonia source, a nitrification inhibitor, urea,
and a urease inhibitor. The fertilizer can also be or include a
mixture of one or more nitrogen sources and a reaction product of
formaldehyde, an ammonia source, a nitrification inhibitor, and a
urease inhibitor. The fertilizer can also be or include a mixture
of one or more nitrogen sources and a reaction product of
formaldehyde, an ammonia source, urea, and a urease inhibitor. The
fertilizer can also be or include a mixture of one or more nitrogen
sources, one or more urease inhibitors, and a reaction product of
any three or more of the following: formaldehyde, an ammonia
source, a nitrification inhibitor, and urea.
[0014] The nitrogen source can include, but is not limited to,
urea, ammonium nitrate, anhydrous ammonia, aqueous ammonia,
urea-formaldehyde polymers, or any combination thereof. The
nitrogen source can be a solid, liquid, gas, or any combination
thereof. Illustrative solid nitrogen sources can be in the form of
pellets, prills, flakes, granules, and the like. Illustrative
liquid nitrogen sources can be aqueous and/or liquid solutions of
one or more nitrogen sources. The nitrogen source can be quick
release nitrogen, controlled release nitrogen, or a combination
thereof. As used herein, the term "quick release nitrogen" refers
to free urea, ammonium nitrate, anhydrous ammonia, aqueous ammonia,
or any combination thereof. As used herein, the term "controlled
release nitrogen" refers to a substituted urea, reacted urea, e.g.,
urea-formaldehyde polymer, or a combination thereof. The term,
"controlled release nitrogen" can also refer to a nitrogen
containing material that coverts more slowly than urea in soil to
plant available nutrients ammonium and nitrate than a reference
quick release nitrogen source. Another suitable nitrogen source can
be or include animal waste(s) such as urine and/or manure produced
by one or more animals, e.g., cows, sheep, chickens, buffalo,
turkeys, goats, pigs, horses, and the like.
[0015] As used herein, the term "nitrification inhibitor" refers to
any compound(s) that reduces, inhibits, or otherwise slows down the
conversion of ammonium (NH.sub.4.sup.+) to nitrate in soil when
present as compared to the conversion of ammonium (NH.sub.4.sup.+)
to nitrate in soil when not present. Illustrative nitrification
inhibitors can include, but are not limited to,
2-chloro-6-trichloromethyl-pyridine,
5-ethoxy-3-trichloromethyl-1,2,4-thiadiazol, dicyandiamide,
2-amino-4-chloro-6-methyl-pyrimidine, 1,3-benzothiazole-2-thiol,
4-amino-N-1,3-thiazol-2-ylbenzenesulfonamide, thiourea, guanidine,
3,4-dimethylpyrazole phosphate,
2,4-diamino-6-trichloromethyl-5-triazine, polyetherionophores,
4-amino-1,2,4-triazole, 3-mercapto-1,2,4-triazole, potassium azide,
carbon bisulfide, sodium trithiocarbonate, ammonium
dithiocarbamate, 2,3, dihydro-2,2-dimethyl-7-benzofuranol
methyl-carbamate, N-(2,6-dimethylphenyl)-N-(methoxyacetyl)-alanine
methyl ester, ammonium thiosulfate, 1-hydroxypyrazole,
2-methylpyrazole-1-carboxamide, derivatives thereof, and any
combination thereof. In at least one example, the nitrification
inhibitor can be or include dicyandiamide (DCD). For example,
1-hydroxypyrazole can be considered a derivative of
2-methylpyrazole-1-carboxamide and ammonium dithiocarbamate can be
considered a derivative of methyl-carbamate.
[0016] As used herein, the term "urease inhibitor" refers to any
compound(s) that reduces, inhibits, or otherwise slows down the
conversion of urea to ammonium (NH.sub.4.sup.+) in soil.
Illustrative urease inhibitors can include, but are not limited to,
N-(n-butyl)thiophosphoric triamide, N-(n-butyl)phosphoric triamide,
thiophosphoryl triamide, phenyl phosphorodiamidate, cyclohexyl
phosphoric triamide, cyclohexyl thiophosphoric triamide, phosphoric
triamide, hydroquinone, p-benzoquinone,
hexamidocyclotriphosphazene, thiopyridines, thiopyrimidines,
thiopyridine-N-oxides, N,N-dihalo-2-imidazolidinone,
N-halo-2-oxazolidinone, derivatives thereof, or any combination
thereof. In at least one example, the urease inhibitor can be or
include N-(n-butyl)thiophosphoric triamide (NBPT).
[0017] The formaldehyde can be used in many forms. For example,
paraform (solid, polymerized formaldehyde) and/or formalin
solutions (aqueous solutions of formaldehyde, sometimes with
methanol, in about 10 wt %, about 20 wt %, about 37 wt %, about 44
wt %, or about 50 wt %, based on the weight of the formalin
solution) are commonly used forms. For example, the formaldehyde
can be an aqueous solution having a concentration of formaldehyde
ranging from about 10 wt % to about 50 wt %, based on a total
weight of the aqueous solution. Formaldehyde gas can also be used.
Formaldehyde substituted in part or in whole with substituted
aldehydes such as acetaldehyde and/or propylaldehyde can be used as
the source of formaldehyde. One or more other aldehydes, such as
glyoxal can be used in place of or in combination with
formaldehyde. Any of these forms of formaldehyde sources can be
used alone or in any combination to prepare the reaction
product.
[0018] The urea can also be used in many forms. For example, the
urea can be a solid in the form of prills, flakes, granules, and
the like, and/or a solution, such as an aqueous solution. Further,
the urea may be combined with another moiety, for example,
formaldehyde and/or urea-formaldehyde adducts, often in aqueous
solution. As noted above, the nitrogen source can be or include
animal waste such as urine and/or manure. As such, at least a
portion of the urea, if present, can be in the form of animal
waste. Any form of urea or urea in combination with formaldehyde
can be used to make a urea-formaldehyde polymer. Both urea prill
and combined urea-formaldehyde products can be used. Illustrative
urea-formaldehyde products can include, but are not limited to,
Urea-Formaldehyde Concentrate ("UFC"). These types of products can
be as discussed and described in U.S. Pat. Nos. 5,362,842 and
5,389,716, for example. Any of these urea sources can be used alone
or in any combination to prepare the reaction product.
[0019] As used herein, the term "ammonia source" refers to ammonia
or any ammonium compound(s) that liberate ammonia when reacted with
the formaldehyde and the nitrification inhibitor. Illustrative
ammonia sources can include, but are not limited to, ammonium salts
such as ammonium chloride and ammonium nitrate, aqueous ammonia or
ammonium hydroxide, anhydrous ammonia, or combinations thereof.
Suitable aqueous ammonium solutions can have an ammonia
concentration of about 28 wt %, about 30 wt %, about 32 wt %, or
about 35 wt %, for example. Other suitable ammonia sources can
include, but are not limited to, primary amines or substituted
primary amines such as methyl amine, monomethanol amine, amino
propanol, or any combination thereof. Difunctional amines such as
ethylene diamine or any combination of organic amines provided that
one primary amine group is available to form a triazone ring can be
used. Another source of ammonia can be in the form of animal waste
such as urine and/or manure. Any of these ammonia sources can be
used alone or in any combination to prepare the reaction product.
And the ammonia source can be used in any form such a liquid,
solid, and/or gas.
Preparation of the Reaction Product Under Acidic Conditions
[0020] The reaction product can be produced under acidic reaction
conditions. For example, the reaction product can be produced by
reacting formaldehyde, the ammonia source, e.g., ammonium chloride,
and the nitrification inhibitor, e.g., dicyandiamide, under acidic
reaction conditions at a pH of less than 7. For example, the acidic
reaction conditions can be at a pH ranging from a low of about 2.5,
about 3, about 3.5, about 4, or about 4.5 to a high of about 5.5,
about 6, about 6.5, or about 6.9.
[0021] The reaction product produced under the acidic reaction
conditions can be prepared by combining, mixing, or otherwise
contacting the reaction components (formaldehyde, the ammonium
source, and the nitrification inhibitor, and optionally urea, the
urease inhibitor, or both) to produce a reaction mixture having a
pH of about 7 or less. For example, the reaction mixture of
formaldehyde, the ammonia source, and the nitrification inhibitor
produced under the acidic reaction conditions can have a pH ranging
from a low of about 3, about 3.5, about 4, or about 4.5 to a high
of about 5.5, about 6, or about 6.5. Similarly, the reaction
mixture of formaldehyde, the ammonia source, the nitrification
inhibitor, and urea and/or the urease inhibitor produced under the
acidic reaction conditions can also have a pH ranging from a low of
about 3, about 3.5, about 4, or about 4.5 to a high of about 5.5,
about 6, or about 6.5. Heat from the exothermic reaction can be
allowed to heat the reaction mixture to a temperature ranging from
a low of about 50.degree. C., about 60.degree. C., or about
65.degree. C. to a high of about 75.degree. C., about 80.degree.
C., about 90.degree. C., or about 100.degree. C. The reaction
mixture can be maintained at an elevated temperature, e.g., from
about 50.degree. C. to about 95.degree. C. for a time ranging from
about 1 minute to about 2 hours. The resulting reaction mixture can
then be cooled to, for example, room temperature, to provide the
reaction product.
[0022] The reaction components (formaldehyde, ammonia source,
nitrification inhibitor, and the optional urea and/or urease
inhibitor) can be combined with one another in any order or
sequence. For example, the formaldehyde and the nitrification
inhibitor can first be combined to form a first mixture and the
ammonia source can then be added to the first mixture to produce a
second mixture. In another example, the formaldehyde and the
ammonia source can be combined to produce a first mixture and then
the nitrification inhibitor can be added to the first mixture to
produce the second mixture. In still another example, the ammonia
source and the nitrification inhibitor can be combined to produce a
first mixture and the formaldehyde can be added to the first
mixture to produce the second mixture. In yet another example, the
formaldehyde, ammonia source, and nitrification inhibitor can be
combined together at the same time to produce a mixture. The
addition of urea and/or the urease inhibitor, if present, can
similarly be combined in any order or sequence to produce the
reaction mixture(s). If the reaction components are combined such
that more than one mixture is formed, e.g., a first mixture and a
second mixture, the first mixture can be at least partially reacted
prior to forming the second mixture. Additional details for
reacting formaldehyde, an ammonia source, and dicyandiamide under
acidic conditions can be similar to those discussed and described
in U.S. Pat. Nos. 3,015,649; 3,639,646; and 4,000,184.
[0023] Prior to the reaction, during the reaction, and/or after the
reaction between the reaction components (formaldehyde, ammonia
source, and nitrification inhibitor, and optionally urea and/or the
urease inhibitor), one or more acidic compounds can be added to
lower the pH of the reaction mixture and/or the reaction product.
Illustrative acids can include mineral acids such as hydrochloric
acid, sulfuric acid, nitric acid, phosphoric acid, or any
combination thereof.
[0024] The reaction product produced under the acidic reaction
conditions can have a pH less than about 7. For example, the
reaction product of formaldehyde, the ammonia source, and the
nitrification inhibitor produced under the acidic reaction
conditions can have a pH ranging from a low of about 3, about 3.5,
about 4, or about 4.5 to a high of about 5.5, about 6, or about
6.5. Similarly, the reaction product of formaldehyde, the ammonia
source, the nitrification inhibitor, and urea and/or the urease
inhibitor produced under the acidic reaction conditions can also
have a pH ranging from a low of about 3, about 3.5, about 4, or
about 4.5 to a high of about 5.5, about 6, or about 6.5.
Preparation of the Reaction Product Under Basic Conditions
[0025] The reaction product can be produced under basic or alkaline
reaction conditions. For example, the reaction product can be
produced by reacting formaldehyde, the ammonia source, e.g.,
ammonium hydroxide, the nitrification inhibitor, e.g.,
dicyandiamide, and optionally urea and/or the urease inhibitor
under basic reaction conditions at a pH of greater than 7. For
example, the basic reaction conditions can be at a pH ranging from
a low of about 7, about 7.5, about 8, about 8.5, or about 9 to a
high of about 9.5, about 10, about 10.5, or about 11.
[0026] The reaction product produced under basic reaction
conditions can be prepared by combining, mixing, or otherwise
contacting the reaction components (formaldehyde, the ammonium
source, and the nitrification inhibitor, and optionally urea, the
urease inhibitor, or both) to produce a reaction mixture having a
pH greater than about 7. For example, the reaction mixture of
formaldehyde, the ammonia source, and the nitrification inhibitor
under the basic reaction conditions can have a pH ranging from a
low of about 8, about 8.5, or about 9 to a high of about 9.5, about
10, about 10.5, or about 11. Similarly, the reaction mixture of
formaldehyde, the ammonia source, the nitrification inhibitor, and
urea and/or the urease inhibitor under the basic reaction
conditions can also have a pH ranging from a low of about 8, about
8.5, or about 9 to a high of about 9.5, about 10, about 10.5, or
about 11. Heat from the exothermic reaction can be allowed to heat
the reaction mixture to a temperature ranging from a low of about
50.degree. C., about 60.degree. C., or about 65.degree. C. to a
high of about 80.degree. C., about 90.degree. C., or about
100.degree. C. The reaction mixture can be maintained at an
elevated temperature, e.g., from about 50.degree. C. to about
90.degree. C. for a time ranging from about 1 minute to about 3
hours. The resulting reaction mixture can then be cooled to, for
example, room temperature, to provide the reaction product.
[0027] The reaction components (formaldehyde, ammonia source,
nitrification inhibitor, and optional urea and/or urease inhibitor)
can be combined with one another in any order or sequence. For
example, formaldehyde and a first portion of the ammonia source can
be combined to produce a first mixture. The first mixture can be at
least partially reacted. The nitrification inhibitor can then be
added to the first mixture or to the at least partially reacted
first mixture to produce a second mixture. The second mixture can
be at least partially reacted. A second portion of the ammonia
source can then be added to the second mixture or to the at least
partially reacted second mixture to produce a third mixture. The
third mixture can be at least partially reacted to produce the
reaction product. The temperature of the first mixture and the
second mixture can be maintained at a temperature ranging from
about 25.degree. C. to about 70.degree. C. The temperature of the
third mixture can range from about 60.degree. C. to about
90.degree. C. and can be held at the increased temperature, e.g.,
from about 75.degree. C. to about 90.degree. C., for a period of
time ranging from about 5 minutes to about 3 hours.
[0028] In another example, formaldehyde and a first portion of the
ammonia source can be combined to form a first mixture. The first
mixture can be at least partially reacted. The nitrification
inhibitor can then be added to the first mixture or to the at least
partially reacted first mixture to produce a second mixture. The
second mixture can be at least partially reacted. Urea can then be
added to the second mixture or the at least partially reacted
second mixture to produce a third mixture. The third mixture can be
at least partially reacted. A second portion of the ammonia source
can be added to the third mixture to produce a fourth mixture. The
fourth mixture can be at least partially reacted to produce the
reaction product of formaldehyde, urea, ammonia, and the
nitrification inhibitor. The temperature of the first mixture,
second mixture, and third mixture can be maintained at a
temperature ranging from about 25.degree. C. to about 70.degree. C.
The temperature of the fourth mixture can range from about
60.degree. C. to about 90.degree. C. and can be held at the
increased temperature for a period of time ranging from about 5
minutes to about 3 hours.
[0029] The addition of the urease inhibitor, if present, can
similarly be combined in any order or sequence to produce another
reaction mixture or can be combined with the first, second, third,
and/or fourth reaction mixture. In another example, the reaction
components (formaldehyde, ammonia source, and nitrification
inhibitor, and the optional urea and/or urease inhibitor) can be
simultaneously combined together to from a single reaction mixture.
In yet another example, the formaldehyde and the nitrification
inhibitor, and, if present, urea and/or urease inhibitor can be
combined to provide a first mixture and the ammonia source can then
be added to the first mixture to produce a second mixture. The
second mixture can then be reacted to produce the reaction
product.
[0030] Exothermic heat generated from the first mixture, second
mixture, third mixture, fourth mixture, or any number of mixtures,
can be used, at least in part, as the heat source for heating any
one or more of the reaction mixtures. In another example, heat can
be introduced to any one or more of the reaction mixtures to
provide a heated reaction mixture via a heating coil or other heat
exchanging device or system. The temperature of the reaction
mixtures can be maintained below a desired maximum temperature,
e.g., 100.degree. C., via a cooling coil or other heat exchanging
device or system.
[0031] One or more bases or base compounds can be added before
and/or during the reaction to any one or more of the reaction
mixtures and/or the reaction product to maintain and/or adjust the
pH thereof. For example, the reaction product produced under basic
reaction conditions can be maintained at a pH of about 8 to about
11 during the reaction and/or for the final reaction product.
Illustrative base compounds suitable for adjusting the pH of the
reaction product can include, but are not limited to, ammonia,
amines, e.g., primary, secondary, and tertiary amines and
polyamines, sodium hydroxide (NaOH), potassium hydroxide (KOH), or
any combination thereof. An aqueous base solution can have any
concentration. For example, an aqueous base solution of sodium
hydroxide, potassium hydroxide, or a combination thereof, having a
concentration ranging from a low of about 5 wt %, about 10 wt %, or
about 15 wt % to a high of about 25 wt %, about 50 wt %, or about
75 wt % can be introduced to one or more of the reaction mixtures
and/or the reaction product in order to adjust and/or maintain the
pH between about 8 and about 11.
[0032] In another example, one or more pH buffering compounds,
which can buffer the pH of the reaction mixture(s) at a desired pH,
can be added at the start of the reaction. Illustrative pH
buffering compounds can include, but are not limited to,
triethanolamine, sodium borate, potassium bicarbonate, sodium
carbonate, potassium carbonate, or any combination thereof. In
another example the one or more pH buffering compounds can be used
in conjunction with one or more base compounds to adjust and/or
maintain a desired pH of the reaction mixture(s).
[0033] The reaction product produced under the basic reaction
conditions can have a pH greater than 7. For example, the reaction
product of formaldehyde, the ammonia source, and the nitrification
inhibitor produced under the basic reaction conditions can have a
pH ranging from a low of about 8, about 8.5, or about 9 to a high
of about 9.5, about 10, about 10.5, or about 11. Similarly, the
reaction product of formaldehyde, the ammonia source, the
nitrification inhibitor, and the urea and/or the urease inhibitor
produced under the basic reaction conditions can also have a pH
ranging from a low of about 8, about 8.5, or about 9 to a high of
about 9.5, about 10, about 10.5, or about 11.
[0034] Additional details for reacting formaldehyde, urea, and an
ammonia source under basic conditions are discussed and described
in U.S. Pat. Nos. 6,632,262 and 7,513,928 and U.S. Patent
Application Publication No. 2006/0196241.
[0035] The reaction product produced via either acidic conditions
or basic conditions can include one or more other additives. For
example, ethylene diamine can be added to the reaction product
and/or to an intermediate mixture formed during the production
thereof. Ethylene diamine can help adjust, control, and/or maintain
water solubility of the reaction product. Other chelating agents
include ethylenediaminetetraacetic acid (EDTA),
diethylenetriaminepentaacetic acid (DPTA),
N(hydroxyethyl)ethylenediaminetriacetic acid (HEDTA),
nitrilotriacetic acid (NTA), along with a wide range of conjugate
bases for the previously listed acids. Suitable commercially
available suspension additives can include, for example, K-Tionic,
which is manufactured and distributed by GBS Biosciences, LLC.
[0036] The reaction product from the reaction of formaldehyde, the
ammonia source, and the nitrification inhibitor under acidic
conditions can include from about 30 mol % to about 70 mol %
formaldehyde, from about 5 mol % to about 25 mol % ammonia, and
from about 15 mol % to about 45 mol % nitrification inhibitor,
based on the total weight of the formaldehyde, ammonia, and
nitrification inhibitor. The formaldehyde can be present in an
amount ranging from a low of about 35 mol %, about 40 mol %, or
about 45 mol % to a high of about 50 mol %, about 60 mol %, or
about 65 mol %, based on the total weight of the formaldehyde,
ammonia, and nitrification inhibitor. The ammonia can be present in
an amount ranging from a low of about 7 mol %, about 10 mol %, or
about 12 mol % to a high of about 15 mol %, about 18 mol %, or
about 20 mol %, based on the total weight of the formaldehyde,
ammonia, and nitrification inhibitor. The nitrification inhibitor
can be present in an amount ranging from a low of about 20 mol %,
about 25 mol %, or about 30 mol % to a high of about 35 mol %,
about 40 mol %, or about 43 mol %, based on the total weight of the
formaldehyde, ammonia, and nitrification inhibitor.
[0037] The reaction product from the reaction of formaldehyde, the
ammonia source, and the nitrification inhibitor under basic
conditions can include from about 30 mol % to about 80 mol %
formaldehyde, from about 10 mol % to about 35 mol % ammonia, and
from about 10 mol % to about 35 mol % nitrification inhibitor,
based on the total weight of the formaldehyde, ammonia, and
nitrification inhibitor. The formaldehyde can be present in an
amount ranging from a low of about 33 mol %, about 37 mol %, or
about 40 mol % to a high of about 60 mol %, about 70 mol %, or
about 75 mol %, based on the total weight of the formaldehyde,
ammonia, and nitrification inhibitor. The ammonia can be present in
an amount ranging from a low of about 12 mol %, about 15 mol %, or
about 20 mol % to a high of about 25 mol %, about 30 mol %, or
about 33 mol %, based on the total weight of the formaldehyde,
ammonia, and nitrification inhibitor. The nitrification inhibitor
can be present in an amount ranging from a low of about 12 mol %,
about 15 mol %, or about 20 mol % to a high of about 25 mol %,
about 30 mol %, or about 33 mol %, based on the total weight of the
formaldehyde, ammonia, and nitrification inhibitor.
[0038] The reaction product from the reaction of formaldehyde,
urea, the ammonia source, and the nitrification inhibitor under
acidic conditions can include from about 30 mol % to about 70 mol %
formaldehyde, from about 5 mol % to about 25 mol % urea, from about
5 mol % to about 25 mol % ammonia, and from about 5 mol % to about
45 mol % nitrification inhibitor, based on the total weight of the
formaldehyde, urea, ammonia, and nitrification inhibitor. The
formaldehyde can be present in an amount ranging from a low of
about 35 mol %, about 40 mol %, or about 45 mol % to a high of
about 50 mol %, about 60 mol %, or about 65 mol %, based on the
total weight of the formaldehyde, urea, ammonia, and nitrification
inhibitor. The urea can be present in an amount ranging from a low
of about 8 mol %, about 10 mol %, or about 12 mol % to a high of
about 18 mol %, about 22 mol %, or about 24 mol %, based on the
total weight of the formaldehyde, urea, ammonia, and nitrification
inhibitor. The ammonia can be present in an amount ranging from a
low of about 7 mol %, about 10 mol %, or about 12 mol % to a high
of about 15 mol %, about 18 mol %, or about 20 mol %, based on the
total weight of the formaldehyde, urea, ammonia, and nitrification
inhibitor. The nitrification inhibitor can be present in an amount
ranging from a low of about 10 mol %, about 15 mol %, or about 20
mol % to a high of about 35 mol %, about 40 mol %, or about 45 mol
%, based on the total weight of the formaldehyde, urea, ammonia,
and nitrification inhibitor.
[0039] The reaction product from the reaction of formaldehyde,
urea, the ammonia source, and the nitrification inhibitor under
basic conditions can include from about 25 mol % to about 65 mol %
formaldehyde, from about 10 mol % to about 25 mol % urea, from
about 5 mol % to about 25 mol % ammonia, and from about 5 mol % to
about 25 mol % nitrification inhibitor, based on the total weight
of the formaldehyde, urea, ammonia, and nitrification inhibitor.
The formaldehyde can be present in an amount ranging from a low of
about 25 mol %, about 30 mol %, or about 35 mol % to a high of
about 50 mol %, about 55 mol %, or about 60 mol %, based on the
total weight of the formaldehyde, urea, ammonia, and nitrification
inhibitor. The urea can be present in an amount ranging from a low
of about 12 mol %, about 14 mol %, or about 16 mol % to a high of
about 18 mol %, about 22 mol %, or about 25 mol %, based on the
total weight of the formaldehyde, urea, ammonia, and nitrification
inhibitor. The ammonia can be present in an amount ranging from a
low of about 7 mol %, about 9 mol %, or about 12 mol % to a high of
about 18 mol %, about 22 mol %, or about 25 mol %, based on the
total weight of the formaldehyde, urea, ammonia, and nitrification
inhibitor. The nitrification inhibitor can be present in an amount
ranging from a low of about 7 mol %, about 9 mol %, or about 12 mol
% to a high of about 18 mol %, about 22 mol %, or about 25 mol %,
based on the total weight of the formaldehyde, urea, ammonia, and
nitrification inhibitor.
[0040] The reaction product from the reaction of formaldehyde, the
ammonia source, and the nitrification inhibitor under acidic
conditions can have a molar ratio of formaldehyde to ammonia
ranging from about 1:1 to about 9:1, about 1:1 to about 8:1, about
3:1 to about 9:1, about 4:1 to about 8:1, about 5:1 to about 9:1,
or about 6:1 to about 8:1. Similarly, the reaction product of
formaldehyde, urea, the ammonia source, and the nitrification
inhibitor and/or the reaction product of formaldehyde, the ammonia
source, the nitrification inhibitor, and the urease inhibitor under
acidic conditions can have a molar ratio of formaldehyde to ammonia
ranging from a bout 1:1 to about 9:1, about 1:1 to about 8:1, about
3:1 to about 9:1, about 4:1 to about 8:1, about 5:1 to about 9:1,
or about 6:1 to about 8:1.
[0041] The reaction product of formaldehyde, the ammonia source,
and the nitrification inhibitor under acidic conditions can have a
molar ratio of formaldehyde to nitrification inhibitor ranging from
about 1:1 to about 4:1, about 1:1 to about 3:1, about 1:1 to about
2:1, about 1.5:1 to about 2.5:1, about 1:1 to about 2.5:1, about
1.7:1 to about 2.3:1, or about 1.8:1 to about 2.2:1. The reaction
product of formaldehyde, the ammonia source, the nitrification
inhibitor, and the urease inhibitor under acidic conditions can
have a molar ratio of formaldehyde to nitrification inhibitor
ranging from about 1:1 to about 4:1, about 1:1 to about 2:1, about
1.5:1 to about 2.5:1, about 1:1 to about 2.5:1, about 1.7:1 to
about 2.3:1, or about 1.8:1 to about 2.2:1. The molar ratio of
formaldehyde to the urease inhibitor in the reaction product of
formaldehyde, the ammonia source, the nitrification inhibitor, and
the urease inhibitor under acidic conditions can be the same or
similar to the molar ratio of formaldehyde to the nitrification
inhibitor.
[0042] The reaction product of formaldehyde, urea, the ammonia
source, and the nitrification inhibitor under acidic conditions can
have a molar ratio of formaldehyde to urea ranging from about 1:1
to about 2:1, about 1:1 to about 1.9:1, about 1.1:1 to about 1.8:1,
about 1.2:1 to about 1.7:1, or about 1.3:1 to about 2:1. The
reaction product of formaldehyde, urea, the ammonia source, the
nitrification inhibitor, and the urease inhibitor under acidic
conditions can have a molar ratio of formaldehyde to urea ranging
from about 1:1 to about 2:1, about 1:1 to about 1.9:1, about 1.1:1
to about 1.8:1, about 1.2:1 to about 1.7:1, or about 1.3:1 to about
2:1.
[0043] The reaction product of formaldehyde, the ammonia source,
and the nitrification inhibitor under basic conditions can have a
molar ratio of formaldehyde to ammonia ranging from about 1:1 to
about 8:1, about 2:1 to about 6:1, about 2.5:1 to about 5:1, about
3:1 to about 4:1, or about 2:1 to about 4:1. The reaction product
of formaldehyde, urea, the ammonia source, and the nitrification
inhibitor under basic conditions can have a molar ratio of
formaldehyde to ammonia ranging from about 1:1 to about 8:1, about
2:1 to about 6:1, about 3:1 to about 5:1, or about 3.5:1 to about
4.5:1. The reaction product of formaldehyde, urea, the ammonia
source, the nitrification inhibitor, and the urease inhibitor under
basic conditions can have a molar ratio of formaldehyde to ammonia
ranging from about 1:1 to about 8:1, about 2:1 to about 6:1, about
3:1 to about 5:1, or about 3.5:1 to about 4.5:1.
[0044] The reaction product of formaldehyde, the ammonia source,
and the nitrification inhibitor under basic conditions can have a
molar ratio of formaldehyde to nitrification inhibitor ranging from
about 1:1 to about 7:1, about 1.5:1 to about 6.5:1, about 2:1 to
about 6:1, about 2.5:1 to about 5:1, about 2:1 to about 4:1, or
about 2.5:1 to about 3.5:1. The reaction product of formaldehyde,
urea, the ammonia source, and the nitrification inhibitor under
basic conditions can have a molar ratio of formaldehyde to
nitrification inhibitor ranging from about 1:1 to about 8:1, about
1:1 to about 7:1, about 2:1 to about 8:1, about 3:1 to about 7.5:1,
or about 3.5:1 to about 7:1.
[0045] The reaction product of formaldehyde, the ammonia source,
the nitrification inhibitor, and the urease inhibitor under basic
conditions can have a molar ratio of formaldehyde to nitrification
inhibitor ranging from about 1:1 to about 7:1, about 1:1 to about
5:1, about 1.5:1 to about 4:1, about 2:1 to about 4:1, about 2.5:1
to about 3.5:1, or about 2.7:1 to about 3.5:1. The molar ratio of
formaldehyde to the urease inhibitor in the reaction product of
formaldehyde, the ammonia source, the nitrification inhibitor, and
the urease inhibitor under basic conditions can be the same or
similar to the molar ratio of formaldehyde to the nitrification
inhibitor.
[0046] The reaction product of formaldehyde, urea, the ammonia
source, and the nitrification inhibitor under basic conditions can
have a molar ratio of formaldehyde to urea ranging from about 1:1
to about 4:1, about 1.1:1 to about 3.9:1, about 1:1 to about 2:1,
about 1:1 to about 1.5:1, or about 1:1 to about 1.3:1. The reaction
product of formaldehyde, urea, the ammonia source, the
nitrification inhibitor, and the urease inhibitor under basic
conditions can have a molar ratio of formaldehyde to urea ranging
from 1:1 to about 4:1, about 1.1:1 to about 3.9:1, about 1:1 to
about 2:1, about 1:1 to about 1.5:1, or about 1:1 to about
1.3:1.
[0047] The reaction product can be produced by reacting
formaldehyde, an ammonia source, and a nitrification inhibitor. In
another example, the reaction product can be produced by reacting
formaldehyde, urea, an ammonia source, and a nitrification
inhibitor. In yet another example, the reaction product can be
produced by reacting formaldehyde, an ammonia source, a
nitrification inhibitor, and a urease inhibitor. In still another
example, the reaction product can be produced by reacting
formaldehyde, urea, an ammonia source, a nitrification inhibitor,
and a urease inhibitor. In another example, the reaction product
can be produced by reacting formaldehyde, an ammonia source, and a
nitrification inhibitor mixed with a urease inhibitor. In still
another example, the reaction product can be produced by reacting
formaldehyde, urea, an ammonia source, and a nitrification
inhibitor mixed with a urease inhibitor. In other words, the urease
inhibitor can be reacted into the reaction product of formaldehyde,
the ammonia source, the nitrification inhibitor, and optionally
urea, mixed with the reaction product, or both.
[0048] The reaction product produced under acidic reaction
conditions or basic reaction conditions can be mixed or otherwise
combined with one or more nitrogen sources to provide a fertilizer
product. If the reaction product includes urea reacted with the
formaldehyde, ammonia source, and nitrification inhibitor, and
optionally the urease inhibitor, the reaction product can be used
alone as a nitrogen fertilizer product. In other words, reaction
products that include reacted urea and formaldehyde or
urea-formaldehyde polymers can be used alone as a nitrogen
containing fertilizer product.
[0049] The reaction product can be mixed, blended, or otherwise
combined with the one or more nitrogen sources to form the
fertilizer. For example, the reaction product can be mixed with the
one or more nitrogen sources in a vessel or container to provide
the fertilizer. Similarly, the one or more nitrogen sources can be
mixed, blended, or otherwise combined with the reaction product to
form the fertilizer. For example, the nitrogen source can be mixed
with the reaction product in a vessel or container to provide the
fertilizer. The amount of the reaction product and the one or more
nitrogen sources can vary, and the amount of the reaction product
can be measured in terms of the amount of nitrogen contained in the
nitrogen source(s). For example, the amount of reaction product in
the fertilizer can range from about 0.1 wt % to about 25 wt %,
based on the total amount of nitrogen in the one or more nitrogen
sources in the fertilizer. In another example, the amount of
reaction product in the fertilizer can range from a low of about
0.5 wt %, about 1 wt %, about 2 wt %, about 3 wt %, about 4 wt %,
or about 5 wt % to a high of about 10 wt %, about 12 wt %, about 15
wt %, about 18 wt %, about 20 wt %, or about 25 wt %, based on the
total amount of nitrogen in the one or more nitrogen sources in the
fertilizer. In another example, the amount of reaction product in
the fertilizer can range from about 0.5 wt % to about 3 wt %, about
5 wt % to about 15 wt %, about 8 wt % to about 12 wt %, or about 10
wt % to about 20 wt %. %, based on the total amount of nitrogen in
the one or more nitrogen sources in the fertilizer.
[0050] In a specific example, a fertilizer product containing 907
kg (2,000 lbs) of a urea ammonium nitrate solution containing 32 wt
% nitrogen (32% UAN) could contain 2.9 kg (6.4 lbs) or 1 wt % of
the reaction product, based on the total amount of nitrogen in the
UAN solution. In another specific example, a fertilizer product
containing 1,000 kg (2,200 lbs) of a 32% UAN solution could contain
about 32 kg (70.5 lbs) or 10 wt % of the reaction product, based on
the total amount of nitrogen in the UAN solution. In yet another
specific example, a fertilizer product containing about 1,000 kg
(2,200 lbs) of anhydrous ammonia, which has an 82 wt % nitrogen
content, could contain about 82 kg (181 lbs) or about 10 wt % of
the reaction product, based on the total amount of nitrogen in the
anhydrous ammonia.
[0051] In another example, the nitrogen source can be mixed with
the reaction product within the soil, on or about the surface of
the soil, or a combination thereof. For example, the nitrogen
source can be or include animal waste such as urine and/or manure
deposited on and/or in the soil. In another example, the nitrogen
source can be or include a fertilizer product previously applied to
the soil. As such, the reaction product can be applied to the soil
and mixed with the animal waste and/or previously applied
fertilizer(s) on the surface of and/or within the soil. The
reaction product can be applied to the soil before, during, and/or
after the animal waste and/or fertilizer(s) are deposited on/in the
soil. In another example, the nitrogen source can be or include
animal waste such as urine and/or manure that can be collected and
placed within a holding tank, pond, or the like, and the reaction
product can be added to the animal waste to provide a mixture. The
mixture can then be deposited about the soil to act as a fertilizer
therein.
[0052] If the nitrogen source includes animal waste such as urine
and/or manure, the amount of the reaction product mixed or
otherwise combined with the nitrogen source that includes the
animal waste can range from about 0.1 wt % to about 25 wt %, based
on the total amount of nitrogen in the one or more nitrogen
sources. In another example, the amount of reaction product mixed
or otherwise combined with the nitrogen source that includes the
animal waste can range from a low of about 0.5 wt %, about 1 wt %,
about 2 wt %, about 3 wt %, about 4 wt %, or about 5 wt % to a high
of about 10 wt %, about 12 wt %, about 15 wt %, about 18 wt %,
about 20 wt %, or about 25 wt %, based on the total amount of
nitrogen in the one or more nitrogen sources in the fertilizer. In
another example, the amount of reaction product mixed or otherwise
combined with the nitrogen source that includes the animal waste
can range from about 0.5 wt % to about 3 wt %, about 5 wt % to
about 15 wt %, about 8 wt % to about 12 wt %, or about 10 wt % to
about 20 wt %, based on the total amount of nitrogen in the one or
more nitrogen sources in the fertilizer. In another example, in
addition to or in lieu of animal waste as providing the nitrogen
source, the nitrogen source can be provided from one or more
previous applications of a fertilizer that contained urea, ammonia,
ammonium nitrate, or any combination thereof, for example. In other
words, the reaction product can be applied to a soil that contains
a fertilizer containing urea, ammonia, ammonium nitrate, animal
waste(s), or any combination thereof previously applied thereto or
a soil to which a fertilizer containing urea, ammonia, ammonium
nitrate, animal waste(s), or any combination thereof may be
expected to be applied thereto.
[0053] In another example, the reaction product can be mixed or
combined with one or more quick release nitrogen sources and one or
more controlled release nitrogen sources to provide the fertilizer.
For example, a fertilizer product can include a mixture of the
reaction product, a urea-formaldehyde polymer (UF), and an aqueous
solution of urea (U), an aqueous solution of ammonium nitrate (AN),
an aqueous solution of urea-ammonium nitrate (UAN), or any
combination thereof. For example, the fertilizer product containing
both quick release and controlled release nitrogen sources can
include the controlled release nitrogen source(s) in an amount
ranging from a low of about 10 wt %, about 20 wt %, about 30 wt %,
or about 40 wt % to a high of about 60 wt %, about 70 wt %, about
80 wt %, about 90 wt %, or about 95 wt %, based on the total weight
of nitrogen in both the controlled release nitrogen source and the
quick release nitrogen source. The fertilizer product containing
both quick release and controlled release nitrogen sources can have
a concentration of the reaction product ranging from about 0.5 wt %
to about 25 wt %, about 1 wt % to about 15 wt %, about 5 wt % to
about 20 wt %, or about 1 wt % to about 20 wt %, based on the total
nitrogen in the quick release nitrogen source(s). In another
example, the fertilizer product can include an aqueous
urea-formaldehyde solution (UF) mixed with a quick release nitrogen
source at a weight ratio from about 90:10 to about 10:90, about
80:20 to about 20:80, about 75:25 to about 25:75, or about 30:70 to
about 70:30 and the reaction product can be present in an amount
ranging from about 1 wt % to about 20 wt % based on the total
amount of nitrogen in the quick release nitrogen source.
[0054] One or more fertilizer nutrient additives can be mixed or
combined with the reaction product and/or a reaction product and
nitrogen source mixture. Illustrative fertilizer nutrient additives
can include, but are not limited to, phosphorous and/or potassium
based nutrients. A commercially available fertilizer nutrient can
include, for example, K-Fol 0-40-53, which is a solution that
contains 40 wt % phosphate and 53 wt % potassium, which is
manufactured and distributed by GBS Biosciences, LLC.
[0055] One or more pesticides, herbicides, fungicides, or any
combination thereof, can also be mixed or combined with the
reaction product and/or a reaction product and nitrogen source
mixture. Suitable pesticides, herbicides, and fungicides are well
known.
[0056] Depending on the particular composition of the reaction
product and/or the particular composition of the fertilizer product
containing the reaction product and one or more nitrogen sources
application rates to soil can widely vary. For example, a
fertilizer product containing the reaction product and one or more
nitrogen sources and having a concentration of the reaction product
ranging from about 0.5 wt % to about 25 wt %, based on the total
amount of nitrogen in the one or more nitrogen sources, can be
applied to a soil in an amount ranging from a low of about 5
kg/hectare (kg/ha), about 10 kg/ha, about 20 kg/ha, about 30 kg/ha,
about 40 kg/ha, or about 50 kg/ha to a high of about 100 kg/ha,
about 150 kg/ha, about 200 kg/ha, about 250 kg/ha, about 300 kg/ha,
about 350 kg/ha, or about 400 kg/ha. In another example, the
reaction product alone can be applied to a soil in an amount
ranging from a low of about 1 kg/ha, about 3 kg/ha, about 5 kg/ha,
about 7 kg/ha, or about 10 kg/ha to a high of about 30 kg/ha, about
35 kg/ha, about 40 kg/ha, about 45 kg/ha, about 50 kg/ha, about 60
kg/ha, about 70 kg/ha, or about 80 kg/ha. The particular amount of
the reaction product, when applied alone to the soil, can be based,
at least in part, on the amount of nitrogen within and/or on the
soil and/or the amount of nitrogen expected to be deposited on
and/or within the soil.
EXAMPLES
[0057] In order to provide a better understanding of the foregoing
discussion, the following non-limiting examples are offered.
Although the examples may be directed to specific embodiments, they
are not to be viewed as limiting the invention in any specific
respect. All parts, proportions, and percentages are by weight
unless otherwise indicated.
Incubation Tests
[0058] Three reaction products (Ex. 1-3) mixed with a urea solution
to produce a liquid fertilizer solution were prepared and
incubation tests were conducted. A comparative example of a urea
only solution, i.e., a urea solution without a reaction product
(C1), and a comparative example of a urea solution mixed with
dicyandiamide (DCD) (C2) were also prepared and evaluated. For
comparative example C2, the urea solution mixed with DCD was not
reacted. In other words, the DCD was mixed with the urea solution
to provide the fertilizer. A Control was also prepared that
consisted of soil, i.e., no nitrogen source nor reaction product
was added.
[0059] For Ex. 1, the reaction product was prepared according to
the following procedure. In a reaction vessel, about 1,640 g of a
50 wt % solution of formaldehyde was added at room temperature and
the temperature was increased to 50.degree. C. with a heating coil.
Over a period of about 15 minutes the temperature was reduced to
25.degree. C. (about 1.7.degree. C. per minute) with a cooling coil
and 1,150 grams of DCD was added. The temperature was raised to
60.degree. C. and then about 208 g of ammonium chloride was slowly
added in small amounts over a period of about 30 minutes. The
addition of ammonium chloride caused an exothermic reaction and
produced a reaction product, i.e., the reaction product. During the
addition of the ammonium chloride the temperature of the reaction
product was allowed to increase to 80.degree. C. and was held for
about 10 minutes at 80.degree. C. and then cooled to room
temperature. The final fertilization additive had a pH of 5.1.
[0060] For Ex. 2, the reaction product was prepared according to
the following procedure. In a reaction vessel, about 1,290 g of a
50 wt % solution of formaldehyde was added at room temperature and
the temperature was increased and maintained between 30.degree. C.
and 50.degree. C. A first portion of ammonium hydroxide (60 g) was
then added to the reaction vessel and the temperature of the
mixture was maintained below 60.degree. C. About 260 g of DCD was
then added to the reaction vessel and the temperature of the
mixture was adjusted to between 35.degree. C. and 50.degree. C.
About 1,378 g urea was then added to the reaction vessel. A second
portion of ammonium hydroxide (250 g) was then added to the
reaction vessel. The temperature of the reaction mixture was
allowed to exothermically increase to about 90.degree. C. for less
than 30 minutes and the temperature was reduced to 85.degree. C.
and held for 120 minutes. After heating the reaction mixture to
85.degree. C., distillation was started and carried out until 416.1
g of distillate was removed from the reaction mixture. A 25 wt %
solution of sodium hydroxide was added throughout the reaction and
distilled as needed to adjust the pH. The pH of the reaction
mixture was kept above 8.4 throughout the reaction. After
distillation the reaction mixture was cooled down to provide the
reaction product for Ex. 2. The reaction product for Ex. 2 had a
final pH of 9.12.
[0061] For Ex. 3, the reaction product was prepared according to
the following procedure. In a reaction vessel, about 555 g of a 50
wt % solution of formaldehyde was added at room temperature. About
260 g of ammonium hydroxide was then slowly added to the reaction
vessel and the temperature was allowed to exothermically increase
to 80.degree. C. About 186 g of DCD was then added to the reaction
vessel and the temperature of the reaction mixture was maintained
at 75.degree. C. for about 20 minutes. The reaction mixture was
then cooled to produce the reaction product for Ex. 3. A 25 wt %
solution of sodium hydroxide was added throughout the reaction as
needed to adjust the pH. The pH of the reaction mixture was kept
above 8.4 throughout the reaction. The reaction product for Ex. 3
had a final pH of 7.81.
[0062] Incubation tests were performed using each Example 1-3 to
evaluate the nitrogen transformations for each sample. The effect
of each reaction product (Ex. 1-3) on the nitrogen concentration in
the soil as both ammonium-nitrogen and nitrate-nitrogen were
evaluated at three different concentrations of the reaction
products. More particularly, the concentration of DCD for a first
set of samples was 0.75 wt % (Table 1), a second set of samples was
1.5 wt % (Table 2), and a third set of samples was 3 wt % (Table
3), where the weight percents of the DCD concentration are based on
the total weight of nitrogen in the urea solution.
[0063] The soil used in the incubation tests was Greenville loamy
soil (clay-loam, siliceous, thermic Plinthic Kandiudults). The soil
had a pH of 6.76, an ammonium-nitrogen concentration of 1.3 ppm,
and a nitrate-nitrogen concentration of 2.4 ppm. The soil had a
total nitrogen concentration of 0.062 wt % prior to adding any of
the fertilizer solutions, an organic matter concentration of 1.14
wt %, a CEC of 16.2 cmol/kg, phosphorus concentration of 3.55 ppm,
a sulfur concentration of 3.5 ppm, and a zinc concentration of 0.11
ppm. The phosphorous and sulfur concentrations were determined
according to the Bray-1 test. The zinc concentration was determined
according to the DTPA (diethylenetriaminepentaacetic acid) soil
test.
[0064] Prior to introducing the fertilizer solutions, each soil
sample was incubated for 1 week at 24.degree. C. and had an initial
moisture at field capacity. As used herein, the term "field
capacity," refers to the drained upper limit or moisture content
below which there is no free drainage flow. During the one week
incubation period the moisture was reduced to about 80%. For each
test 50 g of soil was placed into a cup and each cup was covered
with a lid having four holes to allow for aeration and to minimize
water loss.
[0065] Stock solutions containing each example were prepared by
adding 2.15 g of urea and the corresponding amount of DCD (C2) or
the reaction product (Ex. 1-3) to a 500 mL beaker to provide
samples having 0.75 wt % (Table 1), 1.5 wt % (Table 2), and 3 wt %
(Table 3) DCD based on the total nitrogen concentration in the urea
solution. After adding the urea (C1), urea plus DCD (C2), and urea
plus the reaction products (Ex. 1-3), to the beakers, the contents
of each beaker were diluted to 500 mL with distilled water to
provide a stock solution. For the examples shown in Tables 1-3
below, 5 mL of the corresponding stock solution were introduced via
a pipette onto each 50 g soil sample and the cover was placed
thereon. The amount of nitrogen contained in each example (Ex. 1-3,
C1, and C2) was 10 mg and the nitrogen was in the form of urea. The
soil had at least an 80% field moisture capacity for each sample
and if needed additional distilled water was used in order to
achieve the 80% field moisture capacity.
[0066] Soil extractions were made at 1 week intervals in order to
determine the amount of ammonium-nitrogen and nitrate-nitrogen in
each example. A total of 10 extractions were performed, namely at
time=0 and after the 1.sup.st week, 2.sup.nd week, 3.sup.rd week,
4.sup.th week, 5.sup.th week, 6.sup.th week, 7.sup.th week,
8.sup.th week, and the 10.sup.th week. Extracting the nitrogen from
each sample was done by adding 100 mL of a 2M potassium chloride
(KCl) solution to each soil sample to be tested. The amount of
nitrogen in the form of ammonium (NH.sub.4.sup.+) and nitrate
(NO.sub.3.sup.-) were then determined.
[0067] The amount of ammonium was determined using the well known
Berthelot reaction in which ammonia is chlorinated to
monochloroamine, which then reacts with salicylate to form
5-aminosalicylate. After oxidation and oxidative coupling, a green
color complex was formed which was measured at 660 nm using a
spectrophotometer.
[0068] The determination of nitrate was determined based on the
reduction of nitrate (NO.sub.3) to nitrogen dioxide (NO.sub.2) by
hydrazinium sulfate or cadmium metal. Then nitrite was determined
by diazotizing with sulfanilamide and coupling with
.alpha.-naphthylethylenediamine dihydrochloroide to form a colored
azo dye which was measured at 540 nm with a spectrophotometer.
[0069] Table 1 shows the results for samples that had 0.75 wt % DCD
(C2 and Ex. 1-3) based on a total weight of nitrogen in the urea
solution. Table 2 shows the results for samples that had 1.5 wt %
DCD (C2 and Ex. 1-3) based on a total weight of nitrogen in the
urea solution. Finally, Table 3 shows the results for samples that
had 3% wt DCD (C2 and Ex. 1-3) based on a total weight of nitrogen
in the urea solution.
TABLE-US-00001 TABLE 1 Urea Urea + Only DCD Ex. Ex. Ex. Control
(C1) (C2) 1 2 3 Week Ammonium 0.16 0.39 0.38 0.37 0.43 0.35 0
(NH4.sup.+), mg N Nitrate (NO.sub.3.sup.-), 1.19 1.27 1.19 1.24
1.18 1.17 mg N Week Ammonium 0.13 6.81 8.08 7.40 7.65 8.07 1
(NH4.sup.+), mg N Nitrate (NO.sub.3.sup.-), 1.22 3.61 2.39 3.22
2.89 2.36 mg N Week Ammonium 0.02 4.21 6.95 5.21 5.55 6.42 2
(NH4.sup.+), mg N Nitrate (NO.sub.3.sup.-), 1.27 6.37 3.50 5.35
5.08 4.02 mg N Week Ammonium 0.01 2.14 5.68 2.90 3.95 4.33 3
(NH4.sup.+), mg N Nitrate (NO.sub.3.sup.-), 1.26 8.38 4.73 7.67
6.39 6.01 mg N Week Ammonium 0.01 0.18 4.73 1.90 3.08 3.42 4
(NH4.sup.+), mg N Nitrate (NO.sub.3.sup.-), 1.30 10.45 5.60 8.64
7.37 6.98 mg N Week Ammonium 0.07 0.08 1.68 0.43 1.37 1.43 5
(NH4.sup.+), mg N Nitrate (NO.sub.3.sup.-), 1.35 10.69 8.92 10.25
9.40 9.14 mg N Week Ammonium 0.08 0.08 0.12 0.09 0.11 0.09 6
(NH4.sup.+), mg N Nitrate (NO.sub.3.sup.-), 1.48 10.66 10.50 10.69
10.93 10.77 mg N Week Ammonium 0.09 0.09 0.11 0.11 0.10 0.11 7
(NH4.sup.+), mg N Nitrate (NO.sub.3.sup.-), 1.31 10.85 10.46 10.66
10.67 10.72 mg N Week Ammonium 0.09 0.10 0.11 0.09 0.08 0.09 8
(NH4.sup.+), mgN Nitrate (NO.sub.3.sup.-), 1.40 10.97 10.76 10.88
10.98 10.73 mg N Week Ammonium 0.03 0.04 0.06 0.05 0.05 0.05 10
(NH4.sup.+), mg N Nitrate (NO.sub.3.sup.-), 1.46 10.98 10.86 10.84
11.22 10.82 mg N
[0070] As shown in Table 1, the urea and reaction product solutions
(Ex. 1-3) having a nitrification inhibitor (DCD) concentration of
0.75 wt % based on the amount of nitrogen in the urea performed
substantially better than the urea only solution (C1) and similarly
to the urea+DCD solution (C2). For all the Examples 1-3 the amount
of nitrogen in the form of ammonium (NH4.sup.+) was substantially
increased as compared to the urea only solution (C1) for weeks 3
through 5. At about the 6.sup.th week the ammonium (NH4.sup.+)
concentration for all examples dropped off Similarly, for all the
Examples 1-3 the amount of nitrogen in the form of nitrate
(NO.sub.3.sup.-) was substantially less than the urea only solution
(C1) for weeks 3 through 5. At about the 6.sup.th week the nitrate
(NO.sub.3.sup.-) concentration leveled off. The nitrification
inhibition exhibited by Ex. 1-3 performed similarly to the urea+DCD
solution (C2) in inhibiting the nitrification process.
TABLE-US-00002 TABLE 2 1.5 wt % DCD Based on the Weight of Nitrogen
in the Fertilizer Urea Urea + Only DCD Ex. Ex. Ex. Control (C1)
(C2) 1 2 3 Week Ammonium 0.16 0.39 0.38 0.28 0.27 0.36 0
(NH4.sup.+), mg N Nitrate (NO.sub.3.sup.-), 1.19 1.27 1.20 1.18
1.24 1.28 mg N Week Ammonium 0.13 6.81 8.69 7.51 8.60 8.55 1
(NH4.sup.+), mg N Nitrate (NO.sub.3.sup.-), 1.22 3.61 1.86 2.76
2.17 1.91 mg N Week Ammonium 0.02 4.21 7.97 5.42 7.08 7.80 2
(NH4.sup.+), mg N Nitrate (NO.sub.3.sup.-), 1.27 6.37 2.44 5.03
3.40 2.50 mg N Week Ammonium 0.01 2.14 7.20 3.99 6.20 6.91 3
(NH4.sup.+), mg N Nitrate (NO.sub.3.sup.-), 1.26 8.38 3.19 6.28
4.31 3.41 mg N Week Ammonium 0.01 0.18 6.29 2.55 4.43 5.42 4
(NH4.sup.+), mg N Nitrate (NO.sub.3.sup.-), 1.30 10.45 3.95 7.86
5.93 4.82 mg N Week Ammonium 0.07 0.08 4.23 1.46 3.67 3.61 5
(NH4.sup.+), mg N Nitrate (NO.sub.3.sup.-), 1.35 10.69 6.20 9.02
6.95 6.92 mg N Week Ammonium 0.08 0.08 1.24 0.10 0.54 0.96 6
(NH4.sup.+), mg N Nitrate (NO.sub.3.sup.-), 1.48 10.66 9.10 10.61
10.15 9.25 mg N Week Ammonium 0.09 0.09 0.51 0.11 0.11 0.11 7
(NH4.sup.+), mg N Nitrate (NO.sub.3.sup.-), 1.31 10.85 10.02 10.54
10.94 10.25 mg N Week Ammonium 0.09 0.10 0.11 0.09 0.08 0.08 8
(NH4.sup.+), mg N Nitrate (NO.sub.3.sup.-), 1.40 10.97 10.68 10.92
11.01 10.50 mg N Week Ammonium 0.03 0.04 0.05 0.04 0.04 0.04 10
(NH4.sup.+), mg N Nitrate (NO.sub.3.sup.-), 1.46 10.98 10.63 10.74
10.85 10.61 mg N
[0071] As shown in Table 2, the urea and reaction product solutions
(Ex. 1-3) having a nitrification inhibitor (DCD) concentration of
1.5 wt % based on the total amount of nitrogen in the urea solution
performed substantially better than the urea only solution (C1) and
similarly to the urea+DCD solution (C2). For all the Examples 1-3
the amount of nitrogen in the form of ammonium (NH.sub.4.sup.+) was
substantially greater than the urea only solution (C1) for weeks 3
through 5. Ex. 2 and Ex. 3 showed a substantial increase in the
amount of nitrogen present in the form of ammonium (NH.sub.4.sup.+)
through the 6.sup.th week. Similarly, for all the Examples 1-3 the
amount of nitrogen in the form of nitrate (NO.sub.3.sup.-) was
substantially less than the urea only solution (C1) for weeks 3
through 5. Ex. 2 and Ex. 3 continued to show a substantial
reduction in the concentration of nitrogen in the form of nitrate
(NO.sub.3.sup.-) through the 6.sup.th week. The nitrification
inhibition exhibited by Ex. 1-3 (especially Ex. 2 and 3) performed
similarly to the urea+DCD solution (C2) in inhibiting the
nitrification process.
TABLE-US-00003 TABLE 3 3 wt % DCD Based on the Weight of Nitrogen
in the Fertilizer Urea Urea + Only DCD Ex. Ex. Ex. Control (C1)
(C2) 1 2 3 Week Ammonium 0.16 0.39 0.29 0.34 0.35 0.40 0
(NH4.sup.+), mg N Nitrate (NO.sub.3.sup.-), 1.19 1.27 1.17 1.15
1.19 1.12 mg N Week Ammonium 0.13 6.81 8.74 8.06 9.05 9.01 1
(NH4.sup.+), mg N Nitrate (NO.sub.3.sup.-), 1.22 3.61 1.60 2.26
2.28 1.64 mg N Week Ammonium 0.02 4.21 8.20 7.13 8.55 8.28 2
(NH4.sup.+), mg N Nitrate (NO.sub.3.sup.-), 1.27 6.37 2.07 3.35
2.36 2.27 mg N Week Ammonium 0.01 2.14 7.53 6.36 7.80 7.63 3
(NH4.sup.+), mg N Nitrate (NO.sub.3.sup.-), 1.26 8.38 2.78 4.07
3.10 2.96 mg N Week Ammonium 0.01 0.18 6.05 4.08 6.20 5.83 4
(NH4.sup.+), mg N Nitrate (NO.sub.3.sup.-), 1.30 10.45 4.10 6.22
4.56 4.49 mg N Week Ammonium 0.07 0.08 5.10 2.81 5.21 4.37 5
(NH4.sup.+), mg N Nitrate (NO.sub.3.sup.-), 1.35 10.69 5.18 7.76
5.86 6.14 mg N Week Ammonium 0.08 0.08 1.82 0.78 2.63 1.89 6
(NH4.sup.+), mg N Nitrate (NO.sub.3.sup.-), 1.48 10.66 8.40 9.74
8.38 8.66 mg N Week Ammonium 0.09 0.09 0.61 0.11 0.41 0.12 7
(NH4.sup.+), mg N Nitrate (NO.sub.3.sup.-), 1.31 10.85 9.58 10.48
10.74 10.55 mg N Week Ammonium 0.09 0.10 0.20 0.09 0.41 0.11 8
(NH4.sup.+), mg N Nitrate (NO.sub.3.sup.-), 1.40 10.97 10.35 10.73
10.91 10.74 mg N Week Ammonium 0.03 0.04 0.05 0.04 0.04 0.04 10
(NH4.sup.+), mg N Nitrate (NO.sub.3.sup.-), 1.46 10.98 10.66 10.85
11.35 10.88 mg N
[0072] As shown in Table 3, the urea and reaction product solutions
(Ex. 1-3) having a nitrification inhibitor (DCD) concentration of 3
wt % based on the total amount of nitrogen in the urea solution
performed substantially better than the urea only solution (C1) and
similarly to the urea+DCD solution (C2). For all the Examples 1-3
the amount of nitrogen in the form of ammonium (NH.sub.4.sup.+) was
substantially greater than the urea only solution (C1) for weeks 1
through 6. Ex. 2 showed a substantial increase in the amount of
nitrogen present in the form of ammonium (NH.sub.4.sup.+) through
the 8.sup.th week. Similarly, for all the Examples 1-3 the amount
of nitrogen in the form of nitrate (NO.sub.3.sup.-) was
substantially less than the urea only solution (C1) for weeks 1
through 6. The nitrification inhibition exhibited by Ex. 1-3
(especially Ex. 2 and 3) performed similarly to the urea+DCD
solution (C2) in inhibiting the nitrification process.
[0073] It has been surprisingly and unexpectedly discovered that a
reaction product of the nitrification inhibitor with formaldehyde
and an ammonia source (Ex. 1 and Ex. 3) and a reaction product of
the nitrification inhibitor with formaldehyde, urea, and an ammonia
source (Ex. 2) reduces the rate at which nitrification of the
nitrogen in the fertilizer occurs. As shown in Tables 1-3, the
reaction products of Examples 1-3 showed a substantial decrease in
the rate at which nitrification occurred in the urea only solution
(C1) and performed similarly to the urea+DCD solution (C2).
Leaching Tests
[0074] One reaction product (Ex. 4) mixed with a urea solution to
produce a liquid fertilizer solution was prepared and leaching
tests were conducted. In addition to Ex. 4, two comparative
examples (C3 and C4) were also prepared. Comparative example C3 was
a mixture of urea and DCD. Comparative example C4 was a mixture of
urea ammonium nitrate (UAN), DCD, and a urea-formaldehyde polymer
(UFP).
[0075] The reaction product used to produce the liquid fertilizer
solution of Ex. 4 was the same reaction product used in Ex. 2. For
Ex. 4 and C3, a stock urea solution was prepared by dissolving
152.6 g urea in distilled water and diluting to 1 L. 50 mL of the
stock urea solution was then added to each of two 500 mL volumetric
flasks. To prepare the fertilizer solution of Ex. 4, about 1,008.9
mg of the reaction product of Ex. 4 was added to the first
volumetric flask and distilled water was added to bring the volume
to 500 mL. To prepare the fertilizer solution of comparative
example C3, about 106.2 mg of DCD was added to the second
volumetric flask and distilled water was added to bring the volume
to 500 mL.
[0076] The urea-formaldehyde polymer (UFP) of comparative example
C4 was prepared according to the following procedure. In a reaction
vessel, about 1,884 g of a 50% solution of formaldehyde was added
at room temperature and the temperature was increased and
maintained between about 30.degree. C. and about 50.degree. C. A
first portion of ammonium hydroxide (about 70 g) was then added to
the reaction vessel and the temperature of the mixture was
maintained below about 60.degree. C. About 942 grams of urea was
then added to the reaction vessel and the temperature of the
mixture was adjusted to between about 35.degree. C. and about
50.degree. C. A second portion of ammonium hydroxide (about 403 g)
was then added to the reaction vessel. The temperature of the
reaction mixture was allowed to exothermically increase to about
90.degree. C. for less than 30 minutes and the temperature was
reduced to about 85.degree. C. and held for about 120 minutes
during which time distillation was started and carried out until
about 921 g of distillate was removed form the reaction mixture. A
25 wt % solution of sodium hydroxide was added throughout the
reaction and distillation as needed in order to maintain the pH of
the reaction mixture above about 8.4 throughout the reaction. After
distillation, the reaction mixture was cooled down to provide a
reaction product of the urea-formaldehyde polymer (UFP), which had
a final pH of about 10.2 and a nitrogen concentration of about 22
wt % based on the weight of the reaction product.
[0077] A urea-formaldehyde polymer/urea ammonium nitrate (UFP/UAN)
solution was prepared by blending about 73.3 g of urea ammonium
nitrate (UAN) having a nitrogen concentration of about 32 wt % with
about 26.7 g of the urea-formaldehyde polymer (UFP) to produce an
80:20 blend where about 80% of the nitrogen was in the UAN and
about 20% of the nitrogen was in from the UFP.
[0078] A final solution containing DCD and the UFP/UAN solution was
then prepared. About 12.2 g of the UAN/UFP solution (about 29.1% N)
was then added to a 500 mL volumetric flask along with about 106.2
mg of DCD. The flask was filled to 500 mL using distilled water.
This UAN/UFP/DCD solution was used as the fertilizer of comparative
example C4.
[0079] Table 4 below summarizes the amount of each nitrification
inhibitor included in Ex. 4, C3, and C4.
TABLE-US-00004 TABLE 4 Nitrification Inhibitor Amounts Amount
Percent Inhibitor Amount applied Inhibitor (wt % added to per
column in Total Inhibitor/wt % 500 mL 50 mL (mg Amount of Example
Nitrogen) Flasks (mg) Inhibitor) DCD (mg) Ex. 4 28.5 1,008.9 100.9
10.6 C3 3.0 106.2 10.6 10.6 C4 3.0 106.2 10.6 10.6
[0080] The leaching tests were conducted on two types of soil and
each example (Ex. 4, C3, and C4) was replicated 3 times. As such,
the total number of leaching columns was equal to 3 nitrogen
sources.times.2 types of soil.times.3 replicates for a total of 18
leaching columns.
[0081] The first type of soil used in the leaching tests was
Greenville clay loam soil (a fine, kaolinitic, thermic Rhodic
Kandiudults) having the following properties: a soil pH of about
6.82, an ammonium-N concentration of about 6.3 ppm, a nitrate-N
concentration of about 3.1 ppm, 0.060 wt % total nitrogen, 1.14 wt
% organic matter, a cation exchange capacity (CEC) of about 16.2
cmol kg.sup.-1, a phosphorous concentration (Bray-1 P) of 3.55 ppm,
a sulfur concentration of 3.5 ppm, and a
diethylenetriaminepentaacetic acid-extractable zinc concentration
(DTPA-Zn) of 0.11 ppm. The Greenville soil has optimum pH for
nitrification, moderate texture and a low enough N content to show
the effect of added N fertilizer.
[0082] The second type of soil used in the leaching tests was
Tifton sandy loam soil (a fine-loamy, siliceous, thermic Plinthic
Kandiudults) having the following properties; a soil pH of about
4.90, about 1.15 wt % organic matter, an ammonium-N concentration
of about 4.1 ppm, a nitrate-N concentration of about 9.0 ppm, about
0.038 wt % total nitrogen, a CEC of about 1.8 cmol kg.sup.-1, and
about 79 wt % sand.
[0083] The leaching columns had an inner diameter of 15 cm, a
height of 30 cm, and were kept at room temperature, i.e., between
about 20.degree. C. and 24.degree. C. Each leaching column had the
bottom 5 cm filled with about 800 g of acid-washed sand and the
rest of the column was uniformly filled with about 6 kg of the
appropriate soil. The sand was washed with 1 M HCl, rinsed with
de-ionized water, and spread out to dry before being put in the
leaching columns.
[0084] The duration of the experiment was 10 weeks (2 weeks before
fertilizer application plus a 7 week period of water addition plus
final week of drying cycle). The soil used in the leaching columns
had a soil moisture content at 50% of field capacity for three
weeks before the start of the experiment, i.e., before loading into
the leaching columns. The two types of soil differed in field
capacity moisture content--the Greenville soil had a field capacity
moisture content of 24.5% and the Tifton soil had field capacity
moisture content of 11.52%.
[0085] The total amount of nitrogen (N) applied as either urea or
UAN+UFP to the soil in the leaching columns was equal to about 200
kg N/ha or about 354 mg N/leaching column. In other words, the
total amount of nitrogen (N) applied to each leaching column was
equal to about 354 mg.
[0086] After application of the fertilizer/inhibitor (Ex. 4, C3,
and C4), the leaching columns were maintained at about 80-90% field
capacity moisture content for the first four days. On the fifth
through the seventh days (days 5-7), each leaching column received
14 mm per day water (250 mL per day) delivered uniformly over the
soil surface. The three days of water addition were followed by two
dry days (days 8-9) to ensure soil moisture in none of the leaching
columns exceeded field capacity for a prolonged period of time. The
three-day watering followed by two dry day cycles was repeated up
to day 20. From then on a three-day watering followed by four dry
days was followed until the last water application on day 50. The
last drying continued to the termination of the experiment (on day
57).
[0087] Leachate from the Greenville clay loam soil was analyzed for
DCD about every two days. Table 5 shows the Mean Daily DCD
concentration (ppm), Quantity Leached (mg DCD per day), DCD
Recovery (percent of DCD added to soil that was recovered in the
leachate), and DCD in the Soil (percent of DCD that was not leached
from the soil) for the Greenville clay loam soil.
TABLE-US-00005 TABLE 5 DCD Analysis Results - Greenville Clay Loam
Soil DCD Mean DCD Mean DCD DCD that Daily Daily Recovered in
Remained in Example Leach (ppm) Leach (mg) Leachate (%) Soil (%)
Ex. 4 1.9 0.0067 15.4 84.6 C3 3.23 0.2830 61.4 38.6 C4 3.16 0.2760
59.8 40.2
[0088] As shown in Table 5, the fertilizer of Ex. 4, i.e., the
mixture of urea and the reaction product surprisingly and
unexpectedly substantially outperformed both the urea/DCD solution
(C3) and the UAN/UFP/DCD solution (C4) for inhibiting leaching of
the DCD. The total DCD leaching loss for the urea and reaction
product solution (Ex. 4) was 42 times lower than the urea/DCD
solution (C3) and 41 times lower than the UAN/UFP/DCD solution
(C4). Said another way, the urea and reaction product solution (Ex.
4) maintained 84.6% of the DCD applied to the soil within the soil,
while only 15.4% of the DCD leached out of the soil. In contrast,
the comparative examples C3 and C4 maintained only about 38.6% and
about 40.2% of the DCD applied to the soil within the soil.
Accordingly, Table 5 clearly shows that Ex. 4 performed
substantially superior to both comparative examples (C3 and C4)
that had about 61.4% and about 59.8% of the DCD applied to the
soil, respectively, leached therefrom.
[0089] Leachate from the Tifton sandy loam soil was also analyzed
for DCD about every two days. Table 6 shows the Mean Daily DCD
concentration (ppm), Quantity Leached (mg DCD per day), DCD
Recovery (percent of DCD added to soil that was recovered in the
leachate), and DCD in the Soil (percent of DCD that was not leached
from the soil) for the Tifton sandy loam soil.
TABLE-US-00006 TABLE 6 DCD Analysis Results - Tifton Sandy Loam
Soil DCD Mean DCD Mean DCD DCD that Daily Daily Recovered in
Remained in Example Leach (ppm) Leach (mg) Leachate (%) Soil (%)
Ex. 4 1.94 0.0075 17.1 82.9 C3 3.11 0.2750 59.7 40.3 C4 3.34 0.3090
67.1 32.9
[0090] As shown in Table 6, the fertilizer of Ex. 4, i.e., the
mixture of urea and the reaction product surprisingly and
unexpectedly substantially outperformed both the urea/DCD solution
(C3) and the UAN/UFP/DCD solution (C4) for inhibiting leaching of
the DCD. The total DCD leaching loss for the urea and reaction
product solution (Ex. 4) was about 37 times lower than the urea/DCD
solution (C3) and about 41 times lower than the UAN/UFP/DCD
solution (C4). Said another way, the urea and reaction product
solution (Ex. 4) maintained about 82.9% of the DCD applied to the
soil within the soil, while only about 17.1% of the DCD leached out
of the soil. In contrast, the comparative examples C3 and C4
maintained only about 40.3% and about 32.9% of the DCD applied to
the soil within the soil. Accordingly, Table 6 clearly shows that
Ex. 4 performed substantially superior to both comparative examples
(C3 and C4) that had about 59.7% and about 67.1% of the DCD applied
to the soil, respectively, leached therefrom.
[0091] Not wishing to be bound by theory, it is believed that the
reaction products produced by reacting the nitrification inhibitor
with formaldehyde and an ammonia source (Ex. 1 and Ex. 3) or with
formaldehyde, urea, and an ammonia source (Ex. 2) and (Ex. 4) will
exhibit superior nitrification inhibition in real world
applications as compared to the nitrification inhibitor applied
alone or simply mixed with urea (U), ammonium nitrate (AN), and/or
urea ammonium nitrate (UAN) because leaching of the nitrification
inhibitor into the surrounding soil and away from the nitrogen
source in the fertilizer should be reduced or prevented. In other
words, reacting the nitrification inhibitor into a polymer should
hold or maintain the presence of the nitrification inhibitor at the
point of application, i.e., at the roots of the plant, where the
fertilizer, e.g., urea, ammonium nitrate, or a mixture of urea and
ammonium nitrate, is present, thus providing an improved
nitrification inhibitor. As such, the nitrification inhibitor can
more effectively inhibit the loss of nitrogen from a nitrogen
source through the process of nitrification because tendency for
the nitrification inhibitor to leach into the soil and away from
the fertilizer is reduced or inhibited.
[0092] Additionally, as shown in comparative example C4, simply
mixing the nitrification inhibitor (DCD) with a urea-formaldehyde
polymer instead of reacting the nitrification inhibitor into the
urea formaldehyde polymer (Ex. 1-4) did not decrease the amount of
nitrification inhibitor leached from the soil. Indeed, there is no
statistical difference between the two comparatives C3 and C4.
Accordingly, incorporating the nitrification inhibitor into the
reaction product can more effectively inhibit the loss of nitrogen
from a nitrogen source through the process of nitrification because
tendency for the nitrification inhibitor to leach into the soil and
away from the fertilizer is reduced or inhibited.
[0093] Also, not wishing to be bound by theory, it is believed that
applying a reaction product produced by reacting formaldehyde, an
ammonia source, and a nitrification inhibitor, and optionally urea
and/or a urease inhibitor to soil or other substrates that already
contains or may be expected to contain one or more nitrogen sources
can reduce or prevent the loss of at least one of the one or more
nitrogen sources through the process of nitrification because the
tendency for the nitrification inhibitor to leach into the soil and
away from the fertilizer is reduced or inhibited. As such, the
reaction product can be applied to a soil that contains or may be
expected to contain nitrogen sources such as those introduced to
soil from one or more animals via manure and/or urine and/or
previous fertilizer applications and the loss of the nitrogen
source(s) through nitrification can be reduced or prevented.
[0094] Embodiments described herein further relate to any one or
more of the following paragraphs:
[0095] 1. A fertilizer, comprising: a nitrogen source comprising
urea, ammonia, ammonium nitrate, or any combination thereof; and a
reaction product of formaldehyde, an ammonia source, and a
nitrification inhibitor.
[0096] 2. The fertilizer according to paragraph 1, wherein the
reaction product further comprises urea reacted with the
formaldehyde, ammonia source, and nitrification inhibitor.
[0097] 3. The fertilizer according to paragraph 1 or 2, wherein a
molar ratio of the formaldehyde to ammonia in the reaction product
ranges from about 3:1 to about 9:1 and a molar ratio of the
formaldehyde to nitrification inhibitor in the reaction product
ranges from about 1:1 to about 3:1.
[0098] 4. The fertilizer according to any one of paragraphs 1 to 3,
wherein the reaction product is produced under acidic reaction
conditions and has a pH ranging from about 4 to about 6.
[0099] 5. The fertilizer according to any one of paragraphs 1 to 4,
wherein reacting the formaldehyde, ammonia source, and
nitrification inhibitor comprises: combining the formaldehyde and
the nitrification inhibitor at a molar ratio from about 1:1 to
about 3:1 to produce a first mixture; heating the first mixture to
a temperature ranging from about 50.degree. C. to about 80.degree.
C.; introducing ammonium chloride to the first mixture to produce a
second mixture, wherein the total amount of ammonium chloride
introduced to the first mixture provides a formaldehyde to ammonia
molar ratio ranging from about 3:1 to about 9:1; heating the second
mixture to a temperature ranging from about 70.degree. C. to about
90.degree. C.; and cooling the second mixture to produce the
reaction product.
[0100] 6. The fertilizer according to any one of paragraphs 1 to 5,
wherein the reaction product comprises from about 30 mol % to about
70 mol % formaldehyde, from about 5 mol % to about 25 mol %
ammonia, and from about 15 mol % to about 45 mol % nitrification
inhibitor, based on a total weight of the formaldehyde, the
ammonia, and the nitrification inhibitor.
[0101] 7. The fertilizer according to paragraph 1 or 2, wherein a
molar ratio of the formaldehyde to ammonia in the reaction product
ranges from about 1:1 to about 8:1 and a molar ratio of the
formaldehyde to nitrification inhibitor in the reaction product
ranges from about 1:1 to about 7:1.
[0102] 8. The method according to any one of paragraphs 1, 2, or 7,
wherein the reaction product comprises from about 30 mol % to about
80 mol % formaldehyde, from about 5 mol % to about 25 mol %
ammonia, and from about 10 mol % to about 35 mol % nitrification
inhibitor, based on a total weight of the formaldehyde, the ammonia
source, and the nitrification inhibitor.
[0103] 9. The fertilizer according to any one of paragraphs 1, 2,
7, or 8, wherein the reaction product is produced under alkaline
reaction conditions and has a pH ranging from about 8 to about
11.
[0104] 10. The fertilizer according to any one of paragraphs 1 or 7
to 9, wherein the reaction product is produced by reacting the
formaldehyde, ammonia source, and nitrification inhibitor in water
under alkaline reaction conditions to yield an aqueous reaction
product.
[0105] 11. The fertilizer according to any one of paragraphs 1 or 7
to 10, wherein the reaction product is produced by reacting the
formaldehyde, ammonia source, and nitrification inhibitor at a
temperature ranging from about 70.degree. C. to about 95.degree. C.
and at a pH ranging from about 7.5 to about 10.5 for a time ranging
from about 10 minutes to about 120 minutes.
[0106] 12. The fertilizer according to paragraph 2, wherein the
reaction product is produced by reacting the formaldehyde, urea,
ammonia source, and nitrification inhibitor in water under an
alkaline reaction condition to yield an aqueous reaction
product.
[0107] 13. The fertilizer according to paragraph 2 or 12, wherein
the reaction product is produced by reacting the formaldehyde,
urea, ammonia source, and nitrification inhibitor at a temperature
ranging from about 70.degree. C. to about 95.degree. C. and at a pH
ranging from about 7.5 to about 10.5 for a time ranging from about
10 minutes to about 120 minutes.
[0108] 14. A method for making a fertilizer, comprising: reacting
formaldehyde, an ammonia source, and a nitrification inhibitor
under conditions sufficient to produce a reaction product; and
combining the reaction product with a nitrogen source to produce a
fertilizer, wherein the nitrogen source comprises urea, ammonia,
ammonium nitrate, or any combination thereof.
[0109] 15. A method for reducing nitrification in soil, comprising:
reacting formaldehyde, an ammonia source, and a nitrification
inhibitor under conditions sufficient to produce a reaction
product; applying the reaction product to a soil.
[0110] 16. The method of paragraph 15, wherein one or more nitrogen
sources is disposed within the soil and the reaction product is
combined with the one or more nitrogen sources within the soil.
[0111] 17. The method of paragraph 16, wherein the amount of
reaction product applied to the soil ranges from about 1 kg/ha to
about 50 kg/ha.
[0112] 18. The method according to paragraph 16 or 17, wherein the
amount of the reaction product applied to the soil ranges from
about 1 wt % to about 25 wt %, based on a total amount of nitrogen
in the one or more nitrogen sources.
[0113] 19. The method according to paragraph 14 or 15, further
comprising reacting urea with the formaldehyde, ammonia source, and
nitrification inhibitor to produce the reaction product.
[0114] 20. The method according to paragraph 14, wherein the amount
of reaction product in the fertilizer ranges from about 0.1 wt % to
about 20 wt %, based on a total amount of nitrogen in the nitrogen
source.
[0115] 21. The method according to any one of paragraphs 14 to 20,
wherein a molar ratio of the formaldehyde to ammonia in the
reaction product ranges from about 3:1 to about 9:1 and a molar
ratio of the formaldehyde to nitrification inhibitor in the
reaction product ranges from about 1:1 to about 3:1.
[0116] 22. The method according to any one of paragraphs 14 to 21,
wherein the reaction product has a pH ranging from about 4 to about
6.
[0117] 23. The method according to any one of paragraphs 14 to 22,
wherein reacting the formaldehyde, ammonia source, and a
nitrification inhibitor comprises: combining the formaldehyde and
the nitrification inhibitor at a molar ratio from about 1:1 to
about 3:1 to produce a first mixture; heating the first mixture to
a temperature ranging from about 50.degree. C. to about 80.degree.
C.; introducing ammonium chloride to the first mixture to produce a
second mixture, wherein the total amount of ammonium chloride
introduced to the first mixture provides a formaldehyde to ammonia
molar ratio ranging from about 3:1 to about 9:1; heating the second
mixture to a temperature ranging from about 70.degree. C. to about
90.degree. C.; and cooling the second mixture to produce the
reaction product.
[0118] 24. The method according to any one of paragraphs 14 to 23,
wherein the reaction product comprises from about 30 mol % to about
70 mol % formaldehyde, from about 5 mol % to about 25 mol %
ammonia, and from about 15 mol % to about 45 mol % nitrification
inhibitor, based on a total weight of the formaldehyde, the ammonia
source, and the nitrification inhibitor.
[0119] 25. The method according to any one of paragraphs 14 to 20,
wherein the reaction product comprises from about 30 mol % to about
80 mol % formaldehyde, from about 5 mol % to about 25 mol %
ammonia, and from about 10 mol % to about 35 mol % nitrification
inhibitor, based on a total weight of the formaldehyde, the ammonia
source, and the nitrification inhibitor.
[0120] 26. The method according to any one of paragraphs 14 to 20
or 25, wherein a molar ratio of the formaldehyde to ammonia in the
reaction product ranges from about 1:1 to about 8:1 and a molar
ratio of the formaldehyde to nitrification inhibitor in the
reaction product ranges from about 1:1 to about 7:1.
[0121] 27. The method according to any one of paragraphs 14 to 20,
25, or 26, wherein the reaction product comprises a reaction
product produced under alkaline reaction conditions and has a pH
ranging from about 8 to about 11.
[0122] 28. The method according to any one of paragraphs 14 to 20
or 25 to 27, wherein the reaction product is produced by reacting
the formaldehyde, ammonia source, and nitrification inhibitor in
water under alkaline reaction conditions to yield an aqueous
reaction product.
[0123] 29. The method according to any one of paragraphs 14 to 20
or 25 to 28, wherein the reaction product is produced by reacting
the formaldehyde, ammonia source, and nitrification inhibitor at a
temperature ranging from about 70.degree. C. to about 95.degree. C.
and at a pH ranging from about 7.5 to about 10.5 for a time ranging
from about 10 minutes to about 120 minutes.
[0124] 30. The fertilizer or method according to any one of
paragraphs 1 to 29, wherein the nitrogen source comprises urea,
ammonia, ammonium nitrate, animal manure, animal urine, or any
combination thereof.
[0125] 31. The fertilizer or method according to any one of
paragraphs 1 to 37, wherein the nitrogen source comprises anhydrous
ammonia.
[0126] 32. The fertilizer or method according to any one of
paragraphs 1 to 31, wherein the nitrification inhibitor comprises
2-chloro-6-trichloromethyl-pyridine,
5-ethoxy-3-trichloromethyl-1,2,4-thiadiazol, dicyandiamide,
2-amino-4-chloro-6-methyl-pyrimidine, 1,3-benzothyiazole-2-thiol,
4-amino-N-1,3-thiazol-2-ylbenzene sulfonamide, thiourea; guanidine,
3,4-dimethylpyrazole phosphate,
2,4-diamino-6-trichloromethyl-5-triazine, polyetherionophores,
4-amino-1,2,4-triazole, 3-mercapto-1,2,4-triazole, potassium azide,
carbon bisulfide, sodium trithiocarbonate, ammonium
dithiocarbamate, 2,3, dihydro-2,2-dimethyl-7-benzofuranol
methyl-carbamate, N-(2,6-dimethylphenyl)-N-(methoxyacetyl)-alanine
methyl ester, ammonium thiosulfate, 1-hydroxypyrazole,
2-methylpyrazole-1-carboxamide, derivatives thereof, and any
combination thereof.
[0127] 33. The fertilizer or method according to any one of
paragraphs 1 to 32, wherein the nitrification inhibitor is
dicyandiamide.
[0128] 34. The fertilizer or method according to any one of
paragraphs 1 to 33, wherein the ammonia source comprises one or
more ammonium salts, aqueous ammonia, anhydrous ammonia, or any
combination thereof.
[0129] 35. The fertilizer or method according to any one of
paragraphs 1 to 34, wherein the formaldehyde comprises an aqueous
solution, and wherein the concentration of the formaldehyde in the
aqueous solution ranges from about 10 wt % to about 50 wt %, based
on a total weight of the aqueous solution.
[0130] 36. The fertilizer or method according to any one of
paragraphs 1 to 35, wherein the formaldehyde comprises an aqueous
solution, and wherein a concentration of the formaldehyde in the
aqueous solution ranges from about 37 wt % to about 50 wt %, based
on a total weight of the aqueous solution.
[0131] 37. The fertilizer or method according to any one of
paragraphs 1 to 14 or 19 to 36, wherein a concentration of the
reaction product in the fertilizer ranges from about 0.5 wt % to
about 20 wt %, based on a total amount of nitrogen in the nitrogen
source.
[0132] 38. The fertilizer or method according to any one of
paragraphs 1 to 14 or 19 to 37, wherein a concentration of the
reaction product in the fertilizer ranges from about 1 wt % to
about 15 wt %, based on a total amount of nitrogen in the nitrogen
source.
[0133] 39. The fertilizer or method according to any one of
paragraphs 1 to 38, wherein the nitrogen source is a solid, a
liquid, or a combination thereof.
[0134] 40. The fertilizer or method according to any one of
paragraphs 1, 3 to 18, or 20 to 39, wherein the reaction product
further comprises a urease inhibitor reacted with the formaldehyde,
ammonia source, and nitrification inhibitor.
[0135] 41. The fertilizer or method according to paragraph 2 or 19,
wherein the reaction product further comprises a urease inhibitor
reacted with the formaldehyde, urea, ammonia source, and
nitrification inhibitor.
[0136] 42. The fertilizer or method according to any one of
paragraphs 1 to 41, further comprising one or more urease
inhibitors combined with the reaction product.
[0137] 43. The fertilizer or method according to any one of
paragraphs 40 to 4, wherein the urease inhibitor comprises
N-(n-butyl)thiophosphoric triamide, N-(n-butly)phosphoric triamide,
thiophosphoryl triamide, phenyl phosphorodiamidate, cyclohexyl
phosphoric triamide, cyclohexyl thiophosphoric triamide, phosphoric
triamide, hydroquinone, p-benzoquinone,
hexamidocyclotriphosphazene, thiopyridines, thiopyrimidines,
thiopyridine-N-oxides, N,N-dihalo-2-imidazolidinone,
N-halo-2-oxazolidinone, derivatives thereof, or any combination
thereof.
[0138] 44. The fertilizer or method according to any one of
paragraphs 1 to 14 or 19 to 43, wherein the fertilizer is applied
to a soil in an amount ranging from about 30 kg/ha to about 350
kg/ha.
[0139] 45. The method according to any one of paragraphs 16 to 18,
wherein the one or more nitrogen sources comprise urea, ammonia,
ammonium nitrate, or any combination thereof.
[0140] 46. The method according to any one of paragraphs 16 to 18
or 45, further comprising disposing one or more nitrogen sources on
the soil, within the soil, or both, wherein the one or more
nitrogen sources comprise animal manure, animal urine, or a
combination thereof.
[0141] 47. The method according to any one of paragraphs 16 to 18,
45, or 46, wherein the reaction product is applied to the soil
after the one or more nitrogen sources.
[0142] 48. The method according to any one of paragraphs 16 to 18
or 45 to 47, wherein the reaction product is applied to the soil
before the one or more nitrogen sources.
[0143] Certain embodiments and features have been described using a
set of numerical upper limits and a set of numerical lower limits.
It should be appreciated that ranges from any lower limit to any
upper limit are contemplated unless otherwise indicated. Certain
lower limits, upper limits and ranges appear in one or more claims
below. All numerical values are "about" or "approximately" the
indicated value, and take into account experimental error and
variations that would be expected by a person having ordinary skill
in the art.
[0144] Various terms have been defined above. To the extent a term
used in a claim is not defined above, it should be given the
broadest definition persons in the pertinent art have given that
term as reflected in at least one printed publication or issued
patent. Furthermore, all patents, test procedures, and other
documents cited in this application are fully incorporated by
reference to the extent such disclosure is not inconsistent with
this application and for all jurisdictions in which such
incorporation is permitted.
[0145] While the foregoing is directed to embodiments of the
present invention, other and further embodiments of the invention
may be devised without departing from the basic scope thereof, and
the scope thereof is determined by the claims that follow.
* * * * *