Product Details : Specifications of archetypal Nitrogen Phosphate Potash (NPK - 15-10-15) Description Units amount complete Nitrogen % Min 15 Phosphate % Min 10 Potash % Min 15 damp % Max 2 Calcium PPM Max 25 advance PPM Max 25 atom Size: 1 - 4.75 mm % Min 90 Zinc Sulphate % Min 1 atom acerbity Min 12