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 housing, chemical, biological, and environmental factors, it is not yet possible to express sudden fertility levels with exact quantitative indicators, and it is impossible to summarize soil fertility with the number of one or several factors. Usually, the yield, ie, the blank yield, obtained from the crop without applying any fertilizer is taken as a comprehensive indicator of soil fertility. In general, the high yield of blanks indicates that the soil has a strong fertility and high fertility. On the contrary, soil fertility is weak and fertility is low.
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