Potassium Fertilizer – Mineral, is one of the three most important mineral elements needed for the plant. Used to improve plant nutrition with bile. The main source of potassium fertilizers is the deposits of natural potassium salts. Potassium fertilizers are suitable for all plants and in all soils, but very effective in clay soils and peat lands. Freely soluble in water, potassium is well maintained in the soil, so it can be fertilized in autumn. Potassium chloride and potassium sulfate are produced from potassium fertilizers. It is better to use potassium sulfate because it contains no chlorine harmful to plants.