Abstract
In increasing soil fertility, an important role belongs to legumes, which are capable of fixing nitrogen from the atmosphere. One of these crops is of great interest to soybeans. This crop can be successfully cultivated both green manure and fodder - for grain and green mass. For this, we studied four links of the crop rotation. The research was carried out on the experimental field of the Department of Agriculture, Plant Growing, Breeding and Seed Production of the Chuvash State Agrarian University in 2018-2020. Experimental data showed that the most effective in all quantitative indicators are the links of crop rotation with leguminous crops - soybeans. The most productive were the links in the crop rotation: the second link in the crop rotation: cultivated soybeans - potatoes - barley and the fourth link in the crop rotation: cultivated soybeans - spring wheat - barley. The yield of potatoes and spring wheat in the second year after the soybean predecessor increased by 65.6% and 27.6%, compared with the control. The increase in barley in the aftereffect (third year) was 28.0% and 42.1%, respectively.
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