Reaction products and methods for making and using the same
Reaction products and methods for making and using the same are provided. The reaction products particularly may include adducts of two or more reactants. The adducts particularly can incorporate a nitrification inhibitor, such as DCD. In particular embodiments, reaction products may be formed from the reaction of formaldehyde, DCD, urea, and an ammonia source. The adducts may be included in agricultural products, including fertilizer compositions and nitrification inhibitor systems. Fertilizer compositions including the adducts can be beneficial for reducing leaching of nitrification inhibitors applied to soil.
1. An agricultural composition comprising:
A) a material selected from the group consisting of urea, dicyandiamide (DCD), urea-formaldehyde polymer (UFP), ammonia, and combinations thereof;
B) at least one adduct according to the structure of Formula 4
wherein:
X is O or
R 1 , R 2 , R 3 , and R 4 are independently selected from the group consisting of:
and
wherein, if X=O,
at least one of R 1 , R 2 , R 3 , and R 4 is
and
C) a urease inhibitor.
2. The composition according to claim 1 , wherein the at least one adduct includes an adduct according to the structure of Formula 5 or Formula 6:
3. The composition according to claim 2 , wherein the adduct according to the structure of Formula 5 or Formula 6 is present at a concentration of about 0.1 to about 10 wt. % based on the total weight of the composition.
4. The composition according to claim 2 , wherein the adduct according to Formula 5 and the adduct according to Formula 6 are both present in the composition.
5. The composition according to claim 1 , wherein the composition is an aqueous mixture.
6. The composition according to claim 5 , wherein the aqueous mixture has a pH of 7 or greater.
7. The composition according to claim 5 , wherein the aqueous mixture comprises 2-cyano-1-((4-oxo-1,3,5-triazinan-1-yl)methyl)guanidine, 1-((2-cyanoguanidino)methyl)urea, and DCD.
8. The composition according to claim 7 , wherein the aqueous mixture further comprises urea or ammonia.
9. The composition according to claim 7 , wherein the aqueous mixture further comprises 2-cyano-1-((2-cyanoguanidino)methyl)guanidine.
10. The composition according to claim 1 , wherein the urease inhibitor is N-(n-butyl)thiophosphoric triamide (NBPT), 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, or a combination thereof.
11. A nitrification inhibitor system comprising a mixture of:
a. a triazonyl-formaldehyde-DCD adduct;
b. a urea-formaldehyde-DCD adduct; and
c. a urease inhibitor.
12. The nitrification inhibitor system according to claim 11 , comprising about 0.1 to 10 wt. % of the triazonyl-formaldehyde-DCD adduct based upon the weight of the nitrification inhibitor system.
13. The nitrification inhibitor system according to claim 11 , comprising about 0.1 to 10 wt. % of the urea-formaldehyde-DCD adduct based upon the weight of the nitrification inhibitor system.
14. The nitrification inhibitor system according to claim 11 , further comprising about 0.1 to 10 wt. % of a DCD-formaldehyde-oligomer adduct based upon the weight of the nitrification inhibitor system.
15. The nitrification inhibitor system according to claim 11 , wherein the mixture further comprises water.
16. The nitrification inhibitor system according to claim 11 , wherein the mixture further comprises free DCD.
17. The nitrification inhibitor system according to claim 11 , wherein the urease inhibitor is N-(n-butyl)thiophosphoric triamide (NBPT), 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, or a combination thereof.
18. A method for reducing nitrification in soil, the method comprising: applying an agricultural composition to the soil such that nitrification of a nitrogen source in the soil is reduced, wherein the agricultural composition comprises:
A) a material selected from the group consisting of urea, dicyandiamide (DCD), urea-formaldehyde polymer (UFP), ammonia, and combinations thereof;
B) at least one adduct according to the structure of Formula 4
wherein:
X is O or
R 1 , R 2 , R 3 , and R 4 are independently selected from the group consisting of:
and
wherein, if X=O,
at least one of R 1 , R 2 , R 3 , and R 4 is
and
C) a urease inhibitor.
19. The method according to claim 18 , wherein the nitrogen source is combined with the agricultural composition prior to applying the agricultural composition to the soil.
20. The method according to claim 18 , wherein any one of the following conditions is met:
the amount of the agricultural composition applied to the soil ranges from about 1 kg/ha to about 50 kg/ha;
the method comprises applying the nitrogen source to the soil prior to applying the agricultural composition to the soil; and/or
the agricultural composition is applied to the soil before a nitrogen source is applied to the soil.