About the Fertilizer Tablets: The tablets chemical analysis is as follows: Nitrogen: 20% ( 7% Water Soluble Organic Nitrogen and 13% Water Insoluble Nitrogen) Available Phosphoric Acid: 10%, Soluble Potash: 5%, Combined Sulfur: 2%, Iron: 2.50%, Manganese: 2%, Zinc:0.18%, Magnesium: 2.25%.