... : Agriculture Spec.:13-00-44 Release Type: Controlled Source:Potassium Nitrate Appearance: Granular Longevity: 3Months-12Months(Customized) Product Description ... from: Ammonium Nitrate, Ammonium Phosphate, Monopotassium Phosphate, Potassium Sulfate, Magnesium Sulfate, Calcium Phosphate, Ferrous Sulfate ...