US Patent 10927047 Polymeric compositions which minimize phosphate fixation

Polymeric compositions useful for use with solid or liquid phosphate fertilizers include one or more first copolymers having at least two repeat units selected from maleic, itaconic, and sulfonate repeat units, and one or more second copolymers having maleic and olefinic repeat units. The compositions are capable of synergistically reducing or eliminating phosphate fixation, and are relatively low in cost. The compositions may also be supplemented with product-marking dyes and second copolymers having high and low molecular weight profiles in order to control fines or dust during handling and application of solid phosphate fertilizers.