Solvent systems for dicyandiamide and/or alkyl thiophosphoric triamide and use in agricultural applications

1. A liquid agricultural composition comprising

a nitrification inhibitor comprising dicyandiamide, and

a urease inhibitor comprising N-butyl thiophosphoric triamide,

wherein the urease inhibitor and the nitrification inhibitor is 30 to 60 wt %, by total weight of the liquid agricultural composition;

methylaminopropanol; and

polar aprotic solvent comprising dimethylsulfoxide.

2. The liquid agricultural composition of claim 1 , wherein organic solvent of the composition consists of said methylaminopropanol and said polar aprotic solvent consisting of said dimethylsulfoxide and optionally further comprising at least one organic polar aprotic co-solvent selected from:

a) at least one dibasic ester selected from the group consisting of di(C 1 -C 12 )alkyl esters of saturated linear or branched (C 2 -C 8 )aliphatic dicarboxylic acids or mixtures thereof;

b) at least one compound of formula (IIa):

R 3 OOC-A-CONR 4 R 5 (IIa),

wherein R 3 comprises a C 1 -C 36 alkyl group; wherein R 4 and R 5 individually comprise a C 1 -C 36 alkyl group, wherein R 4 and R 5 can optionally together form a ring;

and wherein A is a linear or a branched divalent C 2 -C 6 alkyl group;

c) at least one alkyldimethylamide;

d) at least one alkylene carbonate;

e) ethyl levulinate; or

f) any combination thereof;

wherein there is an absence of all dioxolane compounds of formula (III):

wherein R 6 and R 7 individually comprises a hydrogen, an alkyl group, an alkenyl group, or a phenyl group, wherein n is an integer of from 1 to 10.

3. The liquid agricultural composition of claim 1 , wherein organic solvent of the composition consists of said polar aprotic solvent and methylaminopropanol, wherein the total N-butyl thiophosphoric triamide urease inhibitor and dicyandiamide nitrification inhibitor is 35 to 45 wt %, by total weight of the liquid agricultural composition.

4. The liquid agricultural composition of claim 1 , wherein the total N-butyl thiophosphoric triamide urease inhibitor and dicyandiamide nitrification inhibitor is 30 to 55 wt %, by total weight of the liquid agricultural composition.

5. The liquid agricultural composition of claim 1 , wherein the liquid agricultural composition consists of:

the dicyandiamide;

the N-(n-butyl)-thiophosphoric triamide;

the dimethylsulfoxide;

the methylaminopropanol;

water; and

dye.

6. The liquid agricultural composition of claim 1 ,

wherein the total N-butyl thiophosphoric triamide urease inhibitor and dicyandiamide nitrification inhibitor is 30 to 45 wt %, by total weight of the liquid agricultural composition.

7. The liquid agricultural composition of claim 1 , wherein the total N-butyl thiophosphoric triamide urease inhibitor and dicyandiamide nitrification inhibitor is 35 to 45 wt %, by total weight of the liquid agricultural composition.

8. The liquid agricultural composition of claim 1 , wherein the total N-butyl thiophosphoric triamide urease inhibitor and dicyandiamide nitrification inhibitor is 30 to 50 wt %, by total weight of the liquid agricultural composition.

9. A method of making a solid or concentrated liquid fertilizer composition comprising treating one or more nitrogenous fertilizer compounds with the liquid agricultural composition of claim 1 wherein the urease inhibitor and the dicyandiamide, are dispersed in a liquid medium comprising the dimethylsulfoxide and the methylaminopropanol,

wherein the urease inhibitor comprises N-butyl thiophosphoric triamide,

wherein the N-butyl thiophosphoric triamide and the dicyandiamide is 30 to 60 wt %, by total weight of the liquid agricultural composition.

10. The method of claim 9 , wherein the urease inhibitor is N-(n-butyl)-thiophosphoric triamide,

wherein the treating is contacting, spray applying or brushing onto the nitrogenous fertilizer compounds, and

wherein the nitrogenous fertilizer compounds are solid.

11. A concentrated liquid fertilizer composition comprising, based on 100 parts by weight of the liquid fertilizer composition:

(a) up to about 99 parts by weight of one or more nitrogenous fertilizer compounds, and

(b) the liquid agricultural composition of claim 1 comprising the N-butyl thiophosphoric triamide, the dicyandiamide, the methylaminopropanol, and the dimethyl sulfoxide,

wherein the N-butyl thiophosphoric triamide and the dicyandiamide is 30 to 60 wt %, by total weight of the liquid agricultural composition.

12. The concentrated liquid fertilizer composition of claim 11 , wherein organic solvent of the composition consists of said polar aprotic solvent and methylaminopropanol.

13. A concentrated liquid fertilizer composition comprising, based on 100 parts by weight of the liquid fertilizer composition:

(a) up to about 99 parts by weight of one or more nitrogenous fertilizer compounds, and

(b) the liquid agricultural composition of claim 1 comprising the N-butyl thiophosphoric triamide, the dicyandiamide, the methylaminopropanol, and the dimethyl sulfoxide,

wherein the N-butyl thiophosphoric triamide and the dicyandiamide is 30 to 60 wt %, by total weight of the liquid agricultural composition,

wherein all organic solvent of the composition is polar aprotic solvent.

14. The concentrated liquid fertilizer composition of claim 13 ,

wherein organic solvent of the liquid agricultural composition consists of the dimethylsulfoxide.

15. A method of making an aqueous end use fertilizer composition comprising contacting one or more nitrogenous fertilizer compounds with the liquid agricultural composition of claim 1 ,

wherein the N-butyl thiophosphoric triamide and the dicyandiamide, are dispersed in a liquid medium comprising the methylaminopropanol and the dimethylsulfoxide,

wherein the N-butyl thiophosphoric triamide and the dicyandiamide is 30 to 60 wt %, by total weight of the liquid agricultural composition.

16. A liquid agricultural composition consisting of

N-butyl thiophosphoric triamide and dicyandiamide, wherein the N-butyl thiophosphoric triamide and dicyandiamide is 30 to 60 wt %, by total weight of the liquid agricultural composition;

dimethylsulfoxide;

methylaminopropanol;

optionally, at least one organic polar aprotic co-solvent selected from:

a) at least one alkylene carbonate;

b) at least one dibasic ester selected from the group consisting of di(C 1 -C 12 )alkyl esters of saturated linear or branched (C 2 -C 8 )aliphatic dicarboxylic acids or mixtures thereof;

c) at least one compound of formula (IIa):

R 3 OOC-A-CONR 4 R 5 (IIa),

wherein R 3 comprises a C 1 -C 36 alkyl group; wherein R 4 and R 5 individually comprise a C 1 -C 36 alkyl group, wherein R 4 and R 5 can optionally together form a ring; and wherein A is a linear or a branched divalent C 2 -C 6 alkyl group;

d) at least one alkyldimethylamide;

e) at least one organophosphate solvent of formula (VIII):

wherein R 1 , R 2 and R 3 , are each independently chosen from H, a C 1 -C 16 alkyl group, a C 1 -C 16 alkenyl, group, a C 1 -C 16 alkoxyalkyl group, a C 7 -C 30 alkylarylalkyl group, a C 7 -C 30 arylalkyl group, or an aryl group; provided that at least one of R 1 , R 2 or R 3 is not H;

f) ethyl levulinate; or

g) any combination thereof;

optionally fertilizer, wherein at least one said fertilizer is a nitrogenous fertilizer;

optionally water; and

optionally at least one dye.

17. The composition of claim 16 , consisting of

the N-butyl thiophosphoric triamide and the dicyandiamide;

the dimethylsulfoxide;

methylaminopropanol;

optionally the fertilizer, wherein at least one said fertilizer is a nitrogenous fertilizer;

optionally the water;

optionally the at least one dye,

wherein the N-butyl thiophosphoric triamide and the dicyandiamide is 30 to 60 wt %, by total weight of the liquid agricultural composition.