Intermediate-release fertilizers and methods for making same
AssigneeOstara Nutrient Recovery Technologes Inc.
InventorsAhren BRITTON, Mikaela VERIGIN, Roland LEATHERWOOD, Ram Prasad Melahalli SATHYANARAYANA
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Abstract
A fertilizer comprises an intermediate-release source of phosphorus. The intermediate-source of phosphorus may be schertelite. In one embodiment, the intermediate-source of phosphorus may consist substantially all of the phosphorous content in the fertilizer. In other embodiments, the fertilizer further comprises one or both of a slow-release and fast-release source of phosphorus. The fertilizer may be in the form of a homogenous prill. A number of methods may be used to make such fertilizers.
Claims42
1-40. (canceled)
A fertilizer composition comprising particles of schertelite, wherein the schertelite content in the fertilizer composition is at least 10% by weight of the fertilizer composition.
A fertilizer composition comprising:
- particles of an intermediate-release source of phosphorus, wherein the solubility of the intermediate-release source of phosphorus is greater than the solubility of a slow-release source of phosphorus characterized by low water solubility and less than the solubility of a fast-release source of phosphorus characterized by high water solubility, wherein the content of the intermediate-release source of phosphorus in the fertilizer composition is greater than about 10% by weight of the fertilizer composition,
- and wherein the solubility of the intermediate-release source of phosphorus is less than the solubility of phosphoric acid, single super phosphate (SSP), double super phosphate (DSP), triple super phosphate (TSP), monoammonium phosphate (MAP), or diammonium phosphate (DAP), and the solubility of the intermediate-release source of phosphorus in water is greater than 170 mg/L at 25° C.
A fertilizer composition comprising:
- particles of an intermediate-release source of phosphorus, wherein the solubility of the intermediate-release source of phosphorus is:
- (a) greater than the solubility of a slow-release source of phosphorus characterized by low water solubility, and
- (b) less than the solubility of a fast-release source of phosphorus characterized by high water solubility;
- wherein the content of the intermediate-release source of phosphorus in the fertilizer composition is greater than about 10% by weight of the fertilizer composition;
- wherein the fast-release source of phosphorus has a solubility in water at 20° C. of at least 120 g/L;
- and
- wherein the solubility of the intermediate-release source of phosphorus in water is greater than about 170 mg/L at 25° C.
A fertilizer composition comprising particles of schertelite, wherein the schertelite content in the fertilizer composition is at least 2% by weight of the fertilizer composition.
A fertilizer composition comprising:
- particles of an intermediate-release source of phosphorus, wherein the solubility of the intermediate-release source of phosphorus is greater than the solubility of a slow-release source of phosphorus characterized by low water solubility and less than the solubility of a fast-release source of phosphorus characterized by high water solubility, wherein the solubility of the intermediate-release source of phosphorus is less than the solubility of phosphoric acid, single super phosphate (SSP), double super phosphate (DSP), triple super phosphate (TSP), monoammonium phosphate (MAP), or diammonium phosphate (DAP), and the solubility of the intermediate-release source of phosphorus in water is greater than 170 mg/L at 25° C.
A fertilizer composition comprising:
- particles of an intermediate-release source of phosphorus, wherein the solubility of the intermediate-release source of phosphorus is greater than the solubility of a slow-release source of phosphorus characterized by low water solubility and less than the solubility of a fast-release source of phosphorus characterized by high water solubility;
- wherein the fast-release source of phosphorus has a solubility in water at 20° C. of at least 120 g/L;
- and
- wherein the solubility of the intermediate-release source of phosphorus in water is greater than 170 mg/L at 25° C.
Dependencies are inferred from the claim text.