Abstract
The article describes the work on the conditions of irrigated meadow-gray soils of the Andijan region, the conduct of subsurface irrigation of cotton varieties Andijan-35 and Andijan-36 was studied. In this method, depending on irrigation schemes and sowing of cotton varieties, the volume mass of meadow-gray soils at the beginning of the growing season in the arable (0-30 cm) layer was 1.27 g/cm3, at the end of the growing season with furrow irrigation it was 1.33 g/cm3 or this indicator increased by 0.06 g/cm3, and with subsurface irrigation amounted to 1.28 g/cm3 or increased by 0.01 g/cm3. The water permeability of the soil at the beginning of the growing season was 927.0 m3/ha, and at the end of the growing season. With furrow irrigation, it amounted to 825.7 m3/ha or decreased by 101.3 m3/ha, with subsurface irrigation it amounted to 906.6 m3/ha or decreased by 21.4 m3/ha compared with the beginning of the growing season, with the furrow irrigation method of cotton varieties Andijan-35 and Andijan-36, 4 irrigations were carried out, scheme 1-2-1, irrigation rate of 4870-4900 m3/ha, 35 irrigations were carried out with subsurface irrigation, scheme 6-19-10, irrigation rate of 2208-2304 m3/ha, where water savings compared to furrow irrigation amounted to 2566-2692 m3/ha or 52.7-54.9 % and an additional crop was obtained from the Andijan variety-35 16,9-17,3 c/ha, a from the Andijan variety-36 14,2-14,4 c/ha, with an increase in the level of profitability by 19.3-20.4 %. Cultivation of Andijan-36 cotton with a row spacing of 60 and 90 cm with furrow irrigation, the irrigation rate was 4864-4974 m3/ha, the yield of raw cotton was 31.2-32.0 c/ha, with subsurface irrigation, the irrigation rate was 2450-2577 m3/ha, and the yield of raw cotton was 46.8-48.0 c/ha or an additional yield of 15.5-16.0 c/ha was obtained compared to furrow irrigation.
01 Introduction
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02 References
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