1. Soil pH value. Different plants have their own favorite soil. Plant crops from the south directly in the north and put them in the greenhouse in time to provide the same heat. If the soil is still in the north, it will not grow well, because every crop has its own favorite pH value.
Second, soil organic matter. The content of organic matter in soil is very small. The organic matter content of most farmland in China is only 0.7%- 1.2%. However, it has great influence on soil fertility and crop health. In a certain range, organic matter content is positively correlated with soil fertility level. Soil rich in organic matter often has the characteristics of good water permeability and permeability, strong fertilizer supply ability, and is not easy to harden and salinize.
Third, salt. If chemical fertilizer is continuously applied to the soil, the chemical fertilizer will remain in the soil and the total salt content in the soil will increase. If the total salt content in the soil reaches a certain range, the soil will tend to be salinized. At the same time, due to the increase of total salt content, the concentration of soil solution is too high, which will directly affect the growth of crop roots.
Fourth, soil microorganisms. As an active part of soil, soil microorganisms help soil particles to form large aggregate structures through the exchange of oxygen and carbon dioxide and the secretion of organic acids in their own lives, and finally form real soil. Today, with the abuse of pesticides and fertilizers, microorganisms can also degrade organic pollutants in the soil, reduce the harm of pesticide residues and help the soil restore health.
Five, trace elements in the soil. When we are in agricultural production, we will find that when crops are unhealthy, it is often caused by the lack of one of the medium elements or trace elements, so we need to supplement this element specially. When all the elements of crops are fully supplemented, healthy crops will bear high-quality fruits.
Sixth, harmful substances. Soil contains various nutrients, beneficial microorganisms and many harmful substances, such as heavy metals, which are bound to harm crops and affect their growth.