According to some embodiments, there is provided herein a process for the production of a unified fertilizer granule of Polyhalite and an N-fertilizer, comprising adding Polyhalite to a fluidized bed reactor; adding said N-fertilizer to said reactor; and allowing the polyhalite and N-fertilizer to mix for 15-120 minutes.

According to some embodiments, there is provided herein a process for the production of a unified fertilizer granule of Polyhalite and an N-fertilizer, comprising adding Polyhalite to a fluidized bed reactor; adding said N-fertilizer to said reactor; and allowing the polyhalite and N-fertilizer to mix for 15-120 minutes.

According to some demonstrative embodiments, there is provided herein a spherical fertilizer granule having a specific gravity of more than 1.94 g/cm.sup.2 and less than 3% porosity.

According to some demonstrative embodiments, there is provided herein a spherical fertilizer granule having a specific gravity of more than 1.94 g/cm.sup.2 and less than 3% porosity.

A controlled-release fertilizer composition, methods of making, and uses thereof are described. The controlled-release fertilizer composition includes a composite graphene-carbon nanotube material having a three-dimensional open-celled network of graphene and carbon nanotubes and a fertilizer impregnated in the three-dimensional open-celled network of graphene and carbon nanotubes.

A controlled-release fertilizer composition, methods of making, and uses thereof are described. The controlled-release fertilizer composition includes a composite graphene-carbon nanotube material having a three-dimensional open-celled network of graphene and carbon nanotubes and a fertilizer impregnated in the three-dimensional open-celled network of graphene and carbon nanotubes.

The present invention relates to increasing and/or maintaining nitrogen content in soil by administration of granular or powdered nitrification inhibitors coated with urease inhibitors. In one embodiment, urease inhibitors are dispersed in an improved organo liquid delivery system at concentration levels of 50-90%. In another embodiment, urease inhibitors were applied in a non-aqueous, organo liquid delivery system coating solid nitrification inhibitors utilizing simple blending equipment at temperatures of 20-70 C. Another embodiment discloses a dry, flowable additive containing a nitrification inhibitor coated with a urease inhibitor which can be administered directly to the soil, to a dry natural and/or a manmade fertilizer or to a liquid fertilizer which provides for the reduction of nitrogen loss from the soil.

The present invention relates to increasing and/or maintaining nitrogen content in soil by administration of granular or powdered nitrification inhibitors coated with urease inhibitors. In one embodiment, urease inhibitors are dispersed in an improved organo liquid delivery system at concentration levels of 50-90%. In another embodiment, urease inhibitors were applied in a non-aqueous, organo liquid delivery system coating solid nitrification inhibitors utilizing simple blending equipment at temperatures of 20-70 C. Another embodiment discloses a dry, flowable additive containing a nitrification inhibitor coated with a urease inhibitor which can be administered directly to the soil, to a dry natural and/or a manmade fertilizer or to a liquid fertilizer which provides for the reduction of nitrogen loss from the soil.

A controlled release fertilizer has been prepared comprising a nutrient core coated with one or more moisture barrier coatings, at least one of said moisture barrier coatings comprising: at least one polyethylene wax; and a thermoset polyurethane from the reaction of a polyol and a polyisocyanate. The weight ratio of thermoset polyurethane to polyethylene wax is from about 50:50 to about 98:2. The polyethylene wax is heated above the melt point of the polyethylene wax and mixed and dispersed into the polyol component of the thermoset polyurethane in a ratio of 90-70% polyol to 10-30% polyethylene wax before the thermoset polyurethane-forming mixture is applied to the surface of the nutrient core and cured. A coating of a high temperature microcrystalline wax can be applied prior to final curing of the thermoset polyurethane to the coated nutrient core particles.

A controlled release fertilizer has been prepared comprising a nutrient core coated with one or more moisture barrier coatings, at least one of said moisture barrier coatings comprising: at least one polyethylene wax; and a thermoset polyurethane from the reaction of a polyol and a polyisocyanate. The weight ratio of thermoset polyurethane to polyethylene wax is from about 50:50 to about 98:2. The polyethylene wax is heated above the melt point of the polyethylene wax and mixed and dispersed into the polyol component of the thermoset polyurethane in a ratio of 90-70% polyol to 10-30% polyethylene wax before the thermoset polyurethane-forming mixture is applied to the surface of the nutrient core and cured. A coating of a high temperature microcrystalline wax can be applied prior to final curing of the thermoset polyurethane to the coated nutrient core particles.