Solvent systems of N-alkyl thiophosphoric triamides and methods of use in agricultural applications

1. A composition comprising:

a) at least one alkyl thiophosphoric triamide as a urease inhibitor, wherein the alkyl thiophosphoric triamide is present in an amount between 15% by weight of the composition and 35% by weight of the composition;

b) a solvent comprising at least one dioxolane compound of formula (Ia):

wherein R 6 and R 7 individually comprises an alkyl group, an alkenyl group, or a phenyl group, wherein n is an integer of from 1 to 10, wherein the dioxolane compound is present in an amount from at least 25% by weight of the composition;

wherein the composition is free of amide solvent.

2. The composition of claim 1 ,

wherein the dioxolane compound is present in an amount from 25% by weight of the composition to 70% by weight of the composition,

optionally further comprising a co-solvent selected from the group consisting of:

at least one dibasic ester;

at least one alkyl lactate;

ethyl levulinate;

at least one alkyoxyalcohol, ether alcohol, amine alcohol, amino alcohol or alcohol;

at least one glycerine or glycerine derivative;

at least one alkylene carbonate;

ketones;

aliphatic or acyclic hydrocarbon solvents;

halogenated solvents;

aromatic hydrocarbon solvents;

cyclic terpenes;

unsaturated hydrocarbon solvents;

halocarbon solvents; and

any combination thereof.

3. The composition of claim 2 , comprising the at least one dibasic ester, wherein the at least one dibasic ester comprises at least two of: dialkyl methylglutarate, dialkyl ethylsuccinate, dialkyl adipate, dialkyl succinate or dialkyl glutarate.

4. The composition of claim 2 , comprising the at least one dibasic ester, wherein the at least one dibasic ester comprises a blend of dialkyl methylglutarate, dialkyl ethylsuccinate and, optionally, dialkyl adipate.

5. The composition of claim 2 , comprising the at least one dibasic ester, wherein the at least one dibasic ester comprises a blend of dialkyl adipate, dialkyl succinate and dialkyl glutarate.

6. The composition of claim 2 , comprising the alkyl lactate, wherein the alkyl lactate is a C 1 -C 8 alkyl lactate.

7. The composition of claim 2 , comprising the alkoxyalcohol, wherein the alkoxyalcohol is 2-butoxyethanol.

8. The composition of claim 2 , comprising the alkylene carbonate, wherein the at least one alkylene carbonate is propylene carbonate.

9. The composition of claim 2 , comprising the amine alcohol, wherein the amine alcohol is selected from the group consisting of ethanolamine, propanolamine, dialkyl alkanolamines, methanolamine, and any combination thereof.

10. The composition of claim 1 , wherein n is an integer of from 1 to 4 and R 6 and R 7 individually comprises an alkyl group, and the alkyl thiophosphoric triamide is N-(n-butyl)-thiophosphoric triamide.

11. The composition of claim 1 , wherein n is an integer of from 1 to 2 and R 6 and R 7 are each selected from the group consisting of methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl, t-butyl, and isobutyl and the alkyl thiophosphoric triamide is N-(n-butyl)-thiophosphoric triamide and present in an amount between 15% by weight of the composition and 26.25% by weight of the composition.

12. The composition of claim 1 , wherein n is 1 and R 6 and R 7 are each methyl, wherein the dioxolane compound is present in an amount from 25% to 70% by weight of the composition, wherein the alkyl thiophosphoric triamide is N-(n-butyl)-thiophosphoric triamide and present in an amount between 20% by weight of the composition and 30% by weight of the composition.

13. The composition of claim 1 ,

wherein the dioxolane compound is present in an amount from 54.65% by weight of the composition to 70% by weight of the composition; and

wherein there is an absence of amide surfactant.

14. The composition of claim 1 , wherein the composition is a flowable liquid composition.

15. The composition of claim 14 , wherein the flowable liquid composition is a homogenous solution.

16. The composition of claim 14 , wherein the flowable liquid composition is a mixture.

17. The composition of claim 1 , wherein the alkyl thiophosphoric triamide is present in an amount between 20% and 35% by weight of the composition.

18. The composition of claim 1 , wherein the alkyl thiophosphoric triamide is N-(n-butyl)-thiophosphoric triamide and present in an amount between 26.25% and 35% by weight of the composition.

19. The composition of claim 1 , wherein the alkyl thiophosphoric triamide is N-(n-butyl)-thiophosphoric triamide and present in the dispersion in an amount between 30% by weight of the dispersion and 35% by weight of the composition.

20. The composition of claim 1 , further comprises at least one dibasic ester blend comprising:

(i) a first dibasic ester of formula:

(ii) a second dibasic ester of formula:

and

(iii) optionally, a third dibasic ester of formula:

wherein R 1 and R 2 individually comprise a C 1 -C 8 alkyl group.

21. A method for preparing an agricultural composition comprising contacting the composition of claim 1 with a nitrogen-based fertilizer composition.

22. The method of claim 21 , wherein the nitrogen-based fertilizer composition is in granular form.

23. The method of claim 21 , wherein the nitrogen-based fertilizer composition is in substantially liquid form.