Mono potassium phosphate, also known as MKP, is a soluble salt that contains potassium and phosphate ions. Its chemical formula is KH2PO4. It is commonly used as a fertilizer in agriculture and horticulture to provide plants with essential nutrients for growth.Mono potassium phosphate is highly soluble in water, which makes it easy to dissolve and apply to plants. It is also readily absorbed by plants and can be used as a source of both potassium and phosphorus, two important macronutrients that plants need for healthy growth.