NPK Compound fertilizer effect is long, should do the base fertilizer, compound fertilizer contains nitrogen, phosphorus, potassium and other nutrients, especially in the early stage of the crop is very sensitive to phosphorus, potassium, phosphorus, potash fertilizer to make the base fertilizer early application. Compound fertilizer should not be used in the seedling stage and late fertilizer, in order to prevent greed and growth. The decomposition of compound fertilizer is slow. For the crops with compound fertilizer as base fertilizer when sowing, the quick nitrogen fertilizer should be added in time when topdressing according to the law of fertilizer demand of different crops, so as to meet the nutritional needs of crops.