Potash fertilizer, full name potassium fertilizers. Potassium is the main nutrient fertilizer, plant body potassium generally accounted for 0.2% ~ 4.1% of dry matter weight, second only to nitrogen. In the process of plant growth and development, potassium participates in the process of activation, photosynthesis, transport of assimilation products, carbohydrate metabolism and protein synthesis in more than 60 enzyme systems.