Concentrated liquid compositions of urease inhibitors for nitrogen sources

A dry, flowable, fertilizer composition comprising:

• (a) a particulate nitrogen source;
• and
• (b) a coating composition, wherein the coating composition comprises i) from 75 weight percent to 95 weight percent N-(n-butyl) thiophosphoric triamide (NBPT), and ii) a non-aqueous organic solvent delivery system (NOSDS), wherein the coating composition has a chill point between 45° C. and 70° C., and wherein the NOSDS comprises dimethyl sulfoxide (DMSO);
• wherein the dry, flowable, fertilizer composition is formed by heating the coating composition to a temperature of 50° C. to 70° C., homogeneously applying the coating composition onto the particulate nitrogen source, wherein the particulate nitrogen source is at a temperature between 60° C. to 80° C., and then cooling a coated particulate nitrogen source to a temperature of 0° C. to 50° C., wherein the coating composition transitions from a liquid to solid thereby forming the dry, flowable fertilizer composition;
• wherein the dry, flowable, fertilizer composition comprises a compositional weight percent range of 0.1-0.5% of NBPT, and a compositional weight percent range of 0.0011%-0.5% of the DMSO;
• and
• wherein the dry, flowable fertilizer composition has a crush strength ranging from 7.0 to 7.85 when stored between 25° C. and 50° C. for 24 hours.