Soil fertility is an essential characteristic of soil. The soil contains almost all the nutrients needed by the crop, but it cannot be fully absorbed by the crop. Only the nutrients dissolved in the soil solution can be absorbed by the crop. The ability of the soil to provide and coordinate nutrient and environmental conditions for normal crop growth is called soil fertility. In formula fertilization, we must first understand the size of soil fertility. Since soil fertility is a comprehensive manifestation of soil physical, chemical, biological and environmental factors, it is not currently possible to express soil fertility levels with exact quantitative indicators, and it is not possible to summarize soil fertility by the number of one or several factors. The yield obtained by planting crops on soil without any fertilizer is the blank yield as a comprehensive indicator of soil fertility. In general, the high yield of blanks indicates that the soil has a strong ability to supply fertilizers and has high fertility. On the contrary, the soil has a weak ability to supply fertilizer and has low fertility.
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