Formula fertilization must achieve the two objectives of exerting soil fertility and fertilizing soil at the same time. It is impossible to rely solely on chemical fertilizers, and organic fertilizer must be added. The role of organic fertilizer, in addition to the supply of soil microbial activity, is conducive to the formation of soil aggregate structure, but also can coordinate the soil in water, fertilizer, gas, heat and other fertility factors, enhance the soil to maintain fertilizer and fertilizer, to create conditions for the high yield and quality of the crop . Therefore, formula fertilization is not a simple ratio of several chemical fertilizers. It should be based on organic fertilizers, combined use of nitrogen, phosphorus, and potassium fertilizers, as well as intermediate and trace elements, so that both high quality and high yields of crops can be achieved, and soils can be maintained and increased. Fertility.
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