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KEMAPCO NOP Standard Grade Potassium nitrate is a water-soluble NK fertilizer containing 13.7% nitrate nitrogen and 46% potassium oxide (38.4%). Comparable with other water-soluble potassium sources, Kemapco Potassium Nitrate offers additional benefits including: High purity and low salt index. High solubility. Low chlorine level. Non detectable Perchlorates level. (virtually free) Slightly acidic ph. High N:K ratio and readily available nitrate nitrogen. Free flowing. Low moisture content. Kemapco Potassium Nitrate is easy and safe to use.