The Effect of Winter Wheat and Repeated Crops on Soil Fertility in the South Of Uzbekistan

Abstract

The article presents the data of a field laboratory experiment conducted in the south of Uzbekistan in 2017-2020. Before sowing, the soil moisture in the 0-30 cm layer averaged 13.6-14.3%, and in the under-arable layer 16.4-16.9% and the volume mass in the arable layer was 1.26-1.28 g/sm³, and in the 30-50 sm layer 1.30-1.32 g/sm³.

Soil moisture at the end of the growing season in the layer of 16.0-16.5% and the volume weight in the arable layer was 1.28-1.30 g/cm3 and in the under-arable layer 1.38-1.40 g/cm3. The water permeability of the soil before sowing oilseeds is 520-550 m3/ha, in the initial state of the soil, the humus content in the 0-30 cm layer was 0.669%, in the under-arable soil layer 0.597%, total nitrogen 0.054-0.059%, respectively, and gross phosphorus 0.124-0.100%. The general condition of nutrients after repeated (oilseed) crops, some increase in their content was observed.

The humus content in the arable soil layer was 0.663-0.785%, the total nitrogen content in the 0-30 cm soil layer was 0.663-0.785%, the total nitrogen content in the 0-30 cm soil layer was 0.088-0.080%, in the under arable 0.050-0.069%, and gross phosphorus respectively 0.130-0.139, and 0.124-0.127 The % content of humus, total nitrogen and total phosphorus increased more after the culture of soybeans, peanuts and sunflower, and a relatively low content was noted in the control (var. 1, 2) variants.