The article presents the results of the experiments on the study of irrigation technologies of cotton in the conditions of grassy-alluvial, saline, and medium loam soil of the Bukhara oasis by lying black film on cotton furrows and using polymer complexes. In field experiments, irrigation technology was carried out by using the irrigation received moisture content of the soil recommended for grassy-alluvial, saline, and medium loam soil of the Bukhara oasis at 70-80-65% compared to LSMC. When the cotton was irrigated 4 times according to the scheme 1-3-0 with irrigation norms of 767, 604, 622, 644 cbm/ha and seasonal irrigation rate of 2637 cbm/ha by covering furrows with the black film and 1818 cbm/ha compared to the control option, the river water was economized and the yield was higher which was 46.8 h/ha. Even when irrigated by using polymer complexes, cotton was irrigated 4 times according to scheme 1-3-0 with irrigation norms of 779, 616, 650, 667 cbm/ha and seasonal irrigation rate of 2712 cbm/ha by using polymer complexes and in this regard, 1743 cbm/ha of the river water as compared to the control option was saved while the yield was 44.8 h/ha. Increased cotton yield by 3.0-5.0 h/ha and saving river water by up to 30-40% was achieved through the irrigation technology by using the screen, which was created by covering the black film and polymer complexes.

The paper presents the results of field experiments on improving leaching technology in salty fields of Bukhara oasis through Biosolvent chemical compound (BChC). Scientific researches were carried in irrigated fields of scientific-research center of Tashkent Institute of Irrigation and Agricultural Mechanization Engineers Bukhara Branch which is located in Bukhara region, Kagan district, during 2017-2019 years. Leaching saline soils through Biosolvent reduces salt content in the active soil layer from 0.417 % to 0.204, while desalinization ratio will be 1.84. With this innovative technology leaching norm was 30% less compared to the control.

Today the water resources have a strategic impact in Bukhara region of Uzbekistan and about 95% of agricultural products produced in irrigated areas of the region. Conservation and efficient use of water resources is imperative. The goal of this research is to provide farmers scientific and practical recommendations on enhancing the soil leaching efficiency and improving the ameliorative condition of arable lands by using Biosolvent chemical compound during the soil leaching. Salts in the composition of the soil, especially soluble, have a serious impact on the development of crops, can dramatically reduce their yield.As a result of the analysis, the degree of soil salinity was determined: the soil is moderately saline, refers to chloride-sulfate salinization. When, soil leaching is carried out by Biosolvent chemical compound at the medium salted soils in Kagan district of Bukhara, the process of salt dissolution in soils accelerated and consumption of water used for soil leaching was saved up to 30% due to the enhancing the soil leaching efficiency.

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