There are three main principles for scientific fertilization: First, the combination of organic and inorganic. Soil organic matter is an important indicator of soil fertility. Adding organic fertilizer can increase soil organic matter content, improve soil physical, chemical and biological properties, improve soil water retention and fertilizer retention capacity, increase soil microbial activity, and promote fertilizer utilization. Second, a large number, medium amount, trace elements to match. The combination of various nutrients is an important part of formula fertilization. With the continuous improvement of yield, in the case of intensive use of cultivated land, it is necessary to emphasize the mutual cooperation of nitrogen, phosphorus and potassium fertilizers, and supplement the necessary medium and trace elements to obtain High yield and stable production. Third, the combination of land use and land reclamation, the balance between input and output.
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