MKP is a fully water-soluble PK fertilizer. It is a    fully water-soluble fertilizer, containing two essential elements for your crop’s development, providing immediately available potassium and phosphorous. Mono Potassium Phosphate is the most readily available fertilizer form of potassium and phosphorous available. As a nitrogen-free fertilizer, Mono Potassium Phosphate is the preferred source of phosphorous and potassium when nitrogen should be limited.