Productivity of winter wheat and reseeding of oilseeds and soil fertility in Southern Uzbekistan

The paper presents the results of the effect of winter wheat and repeated sowing of oilseed crops on soil fertility. In the field experiments, the following variants were studied: winter wheat (control), winter wheat + soybeans, winter wheat + sunflower, winter wheat + peanuts, winter wheat + sesame, winter wheat + safflower, cotton on cotton (control). The soils of the experimental plot are takyr-like, takyr-meadow of heavy loam composition. The soil is poor in humus, nitrogen and total phosphorus, and rich in carbonates (8-10%). Studies have shown that winter wheat and repeated oilseed crops have a positive impact on the agrophysical and agrochemical properties of takyr-like soils in the southern part of Uzbekistan. Winter wheat, repeated oilseed crops contribute to the decrease of soil density by 0.04-0.08 g/cm3 and increase of humus in arable layer after repeated oilseed crops by 0.04-0.07% in comparison with the control variant.