Stabilized dcd and/or alkyl thiophosphoric triamide solvent systems and use in agricultural applications

A stable liquid agricultural composition comprising

• 10 to 40 wt. % at least one urease inhibitor, wherein the urease inhibitor comprises alkyl thiophosphoric triamide;
• a solvent blend comprising a mixture of triethylene glycol and polypropylene glycol;
• optionally, dimethyl sulfoxide;
• optionally, at least one nitrification inhibitor;
• optionally, at least one co-solvent selected from the group consisting of:
• (a) at least one dioxolane compound of formula (II.b):
• wherein R6 and R7 individually comprises a hydrogen, an alkyl group, an alkenyl group, or a phenyl group, wherein n is an integer of from 1 to 10;
• and (b) at least one compound of formula (III):
• R3OOC-A-CONR4R5 (III),
• wherein R3 comprises a C1-C36 alkyl group;
• wherein R4 and R5 individually comprise a C1-C36 alkyl group, wherein R4 and R5 can optionally together form a ring;
• and wherein A is a linear or a branched divalent C2-C12 alkyl group;
• and
• optionally, an amine stabilizer according to formula (IV):
• wherein R1 is H, CH3, CH2CH3, or a branched or linear C2-C5 alkyl group;
• R2 is H, CH3, CH2CH3, or a branched or linear C2-C5 alkyl group;
• R3 is H, CH3 or a branched or linear C2-C5 alkyl group;
• and R4 is H, CH3 or a branched or linear C2-C5 alkyl group.