Liquid formulations of urease inhibitors for fertilizers
AssigneeSoilgenic Technologies, LLC
InventorsGary David McKnight, David Bruce Parker, Yang Zehni, Ray Perkins, Wei Xu
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Abstract
An improved solvent system for the formulation and application of N-alkyl thiophosphoric triamide urease inhibitors. These formulations provide safety and performance benefits relative to existing alternatives and enable storage, transport and subsequent coating or blending with urea based or organic based fertilizers. These formulations are comprised primarily of environmentally friendly aprotic and protic solvents (particularly dimethyl sulfoxide and alcohols/polyols) to stabilize the urease inhibitor.
Claims17
A method of making an inhibited coated solid fertilizer composition comprising:
- applying a non-aqueous liquid coating solution to a solid urea granule thereby forming the inhibited coated solid fertilizer composition,
- wherein the non-aqueous liquid coating solution comprises a) DMSO and b) one or more urease inhibitors,
- wherein the inhibited coated solid fertilizer composition includes a controlled and homogenous layer surrounding the solid urea granule.
A method of coating granular urea to generate coated inhibited granular urea comprising:
- mixing the granular urea with a dissolved urease inhibitor in a non-aqueous solvent delivery system that comprises DMSO thereby forming the coated granular urea,
- wherein the coated granular urea includes a controlled and homogenous layer surrounding the granular urea.
Dependencies are inferred from the claim text.