What are the significances of mechanical soil cultivation for the growth of high-oil soybeans?

1) The effect of soil cultivation on the growth and development of soybean. Although the cultivation itself cannot directly add nutrients, moisture and energy to the soil, the soil fertility can be increased indirectly by changing the soil fertility factors such as tillage structure through tillage. In the soil-soybean-climate system, soil, climate, and their interactions affect the growth and development of soybeans. By improving the condition of the soil, it is possible to exploit the advantages of climate resources or buffer the influence of adverse climatic conditions on the growth of high-oil soybeans. The so-called good plough layer structure means that the structure composed of the soil layers within the depth of tillage conforms to the requirements of soybean growth and development. The contents include: the relationship between soil minerals and organic matter and total porosity; the ratio of capillary pores to non-capillary pores in total pores. Proper proportions allow the soil to form a suitable bottom-up gradient of moisture and air gradients to achieve a reasonably coordinated operational relationship between soil air and moisture. In this way, the four soil factors, namely water, fertilizer, gas and heat, are in a state of high effective fertility and are conducive to the growth and development of soybean. 2) Soybean growth and development requirements on soil tightness. The tightness of the plough layer is the total performance of the soil pores in the cultivating layer. The plough layer soil is too loose, and the total porosity is large. Among them, large pores predominate. In this case, though easy to cultivate and strong in permeability, the water holding capacity is weak, and the ability of the soil to regulate moisture is poor. In addition, when there are too many pores, aerobic microbial activity is strong, mineralization of soil organic matter is intense, and non-productive consumption of soil nutrients is increased, and soil nutrients are difficult to supply due to lack of water. Therefore, lightweight soils should be repressed in time to reduce total porosity and improve capillary porosity. In contrast, plough layer soils are more viscous, soil bulk density is higher, soil compaction, and total porosity is low, in which non-capillary pores are less than 10% of total porosity, resulting in poor soil ventilation and poor water permeability. The imbalance between soil moisture and air will be detrimental to the decomposition of aerobic microorganisms, reduce the effectiveness of soil nutrients, increase root growth resistance, and affect root growth. In northern China, when there is a lot of drought in spring, the surface soil moisture is often close to the point of wilting, and vaporous water often diffuses and loses moisture, affecting the seed germination. Therefore, during the spring sowing, it is required that the seedbeds be compacted after sowing so as to increase the moisture content of the topsoil and facilitate the emergence of seedlings. Entering the rainy season in July-August is a time when the soybean crop will flourish. The roots grow deeper. The respiration of the roots and the metabolic activity of soil microorganisms consume large amounts of oxygen and emit large amounts of CO2. At this time, some loose soil is required to enhance soil gas exchange and renewal and promote root growth. Therefore, at this stage, the mechanized cultivating and cultivating of loose soil is improved, soil elasticity at all levels is improved, the soil is ventilated and permeable, the water is drained and drained, and the resilience of the soil is enhanced.

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