Potassium is one of the three main elements which was need by maize in its growth and development.Maize roots,stalks and leaves can not grow regularly on soil insufficient of potassium.The uptake of water and nutrients are affected,and photosynthesis is lower and transportation of carbohydrate limited.So maize is susceptible to diseases,drought,cold stress and easy to lodging.As a result,yield and quality of maize are lower.