By crop variety
Nitrogen, phosphorus and potassium compound fertilizer should be selected for general field crops, and nitrogen, phosphorus and potassium ternary compound fertilizer should be selected for high-yield wheat fields; Wheat, rice, millet and other closely planted crops are suitable for powdered compound fertilizer; Granular compound fertilizer should be selected for thinly planted crops such as corn; Vegetables, especially fruits and vegetables, root vegetables, fruit trees and other economic crops need more, so nitrogen, phosphorus and potassium compound fertilizer with high potassium and low nitrogen should be selected.
According to soil properties
For the soil with slightly alkaline, low organic matter content (soil pH value is generally about 8.0) and lack of available nitrogen and phosphorus, acidic compound fertilizer, such as monoammonium phosphate or humic acid nitrogen phosphorus potassium compound fertilizer and nitrogen phosphorus compound fertilizer, should be selected. However, alkaline compound fertilizer, such as diammonium phosphate, should be selected for a few red clay or acid brown soil.
According to fertilization method
In order to improve the fertilizer efficiency of compound fertilizer, different dosage forms of compound fertilizer should be selected for different application methods. Granular compound fertilizer must be used as base fertilizer, and the higher the hardness of particles, the better, and the longest fertilizer effect. The selection of compound fertilizer made of ammonium nitrogen in compound fertilizer is beneficial to improve the utilization rate of nitrogen. For topdressing application, powdered compound fertilizer should be selected, and it should be noted that the content of water-soluble phosphorus in compound fertilizer phosphorus should be greater than 40%, and the compound fertilizer composed of ammonium nitrogen and nitrate nitrogen is appropriate. Generally, the effect of basic application of humic acid compound fertilizer is better than that of topdressing.