Research aim: The aim of research work is, under the conditions of the Bukhara oasis, to study Lemna minor, Pistia stratiotes and Azolla caroliniana aquatic plants in the laboratory conditions as well as conducting experiments on the production of high-yielded algaes in collective farms under the field conditions, reducing mineralization of collector-drainage water and improving water quality, studying the growth, development and productivity of crops as a result of improved irrigation with improved drainage water quality, development of scientific and practical recommendations for farms and water management organizations.
Study area: The study was carried out at the educational-scientific laboratory of the Bukhara branch of the Tashkent Institute of Irrigation and Agricultural Mechanization Engineers as well as at the Yulduz drainage, which flows through the territory of Bukhara province’s “Mohammad Chorukiy” farm.
Scientific novelty of the research: The scientific novelty of the study consists of the following items:
to determine highly-mineralized drainage systems in the Bukhara province and study their changes due to natural and anthropogenic impacts;
to study the effectiveness of Lemna minor, Pistia stratiotes and Azolla caroliniana aquatic plants, reduction of their drainage water mineralization in the laboratory conditions;
to study the effect of Lemna minor, Pistia statiotes and Azolla caroliniana regarding their reduction of drainage mineralization in small reservoirs;
to investigate the growth, development and productivity of cotton as a result of irrigation with improved quality of drainage water and prepare scientific and practical recommendations on the basis of the research.
Implementation of the research results: Based on the results of the research, reduction potential of the mineralization of collector-drainage waters by a biological method and their use in irrigated agriculture have been practiced on irrigated lands of farms of Bukhara, Ramitan, Peshku and Shafirkan districts of Bukhara province over an area of 133 hectares during 2014-2016 for irrigation of Bukhara-6 cotton sort (data of the Ministry of Agriculture and Water Resources №04 / 32-342 on February 17, 2017). At the same time, the negative effects of water deficit were reduced, a yield of 5.4-6.2 cc/ha of raw cotton was obtained and pollution of the surrounding environment was addressed.
Structure and the volume of the thesis: The structure of the thesis consists of an introduction, five chapters, conclusions, a list of references, and implementation. The volume of the thesis is 120 pages.
