Улучшение агрохимического состояния орошаемых почв сероземной зоны бассейна Кашкадарьи

Аннотация

of dissertation sent out on «___» ______ 2018 y. (mailing report № ___on «___» _________2018 y.) N.M.Ibragimov Interim chairman of the Scientific Council on awarding of scientific degrees, Dr.Agr.Sc., professor N.Y.Abdurakhmonov Scientific secretary of the Scientific Council on awarding of scientific degrees, PhD, Senior Researcher M.M.Toshkuziev Chairman of the Scientific Seminar under the Scientific Council on awarding of scientific degrees, Dr.Bio.Sc., professor 40 INTRODUCTION (abstract of PhD thesis) The purpose of the research work is to determine the processes of evolutionary changes in the irrigated soil cover of the Hungry Steppe under the influence of anthropogenic factors, the level of fertility of irrigated soils and compilation of soil-evaluation maps, and the development of a set of measures aimed at preserving and enhancing soil fertility. The object of the research. The research was carried out at key areas of Boyovut, Gulistan, Syrdarya and Sayhunabad regions, which are characteristic for the region, located on the old-developed territories of the Hungry Steppe. The scientific novelty of the research are follows: For the first time the dynamics of nutrient elements, salinization- desalinization processes and evolutionary changes in the soil cover were determined; For the first time for the soils of the region, stages of evolutionary development and morphogenetic changes in irrigated serozem-meadow and meadow soils have been substantiated as a result of the development of light serozem soils developed in arid regions; The obtained data are compared with the results of previous years' studies, the changes in their properties and the degree of fertility are determined; Soils common in the studied territories were estimated on 100 point closed scale and for the first time electronic-digital soil-evaluation maps of the areas with scale 1: 10000 were created. Implementation of the research results. Based on research, evolution and assessment of the fertility of old-developed soils of the studied territories of the Hungry Steppe: a recommendation was made on the condition of the soils of the Syrdarya region, as well as the allocation and agrotechnology of growing of agricultural crops on unproductive land (reference of the State Committee for Land Resources, Geodesy, Cartography and State Cadastre No. 03-05-3475 of May 3, 2018). This recommendation serves as a scientific basis for placing vegetable, melon, leguminous, oilseeds, and forage crops, creating orchards and vineyards, taking into account the main factors limiting the soil fertility, based on the soil and climatic conditions of the Syrdarya region, as well as in the development of agrotechnological measures for their cultivation; evaluated irrigated soils of the "1-Bayaut" area of Boyavut district, A. Temur of the Gulistan district, A. Temur of Sayhunabad region, as well as the "Malik" area of Syrdarya region located on the old-developed territories of the Hungry Steppe. As a result, soil-evaluation maps of 1:10,000 scale for areas and 1:5,000 scale for farms have been created for the above-mentioned areas; soil-evaluation maps of 14020.6 hectares of land areas of the investigated territory have been introduced into production (reference of the State Committee for Land Resources, Geodesy, Cartography and State Cadastre No. 03-05-3475 of May 3, 2018). These soil-evaluation maps serve as the basis for the placement of crops, taking into 41 account the quality of soils, calculating the normative assessment of lands, determining crop yields, allocating lands for non-agricultural purposes, and determining a single land tax. Structure and volume of the dissertation. The dissertation consists of introduction, 4 chapters, conclusion, the list of references, applications. The volume of the dissertation is 120 pages. 42 ЭЪЛОН ҚИЛИНГАН ИШЛАР РЎЙХАТИ СПИСОК ОПУБЛИКОВАННЫХ РАБОТ LIST OF PUBLISHED WORKS I бўлим (I часть; I part) 1. Собитов Ў.Т. Эскидан суғориладиган бўз-ўтлоқи тупроқ хоссаларининг ўзгариши // ЎзМУ хабарлари. – Тошкент, 2011. -№1/1. – Б. 141-144. (03.00.00 №9). 2. Собитов Ў.Т., Абдурахмонов Н.Ю. Мирзачўлнинг эскидан ўзлаштирилган тупроқлари унумдорлиги // ЎзМУ хабарлари. – Тошкент, 2011. -№1/1. – Б. 145-147. (03.00.00 №9). 3. Собитов У.Т., Абдурахмонов Н.Ю. Характеристика и степень плодородия орошаемых почв Мирзачульского оазиса // Журнал Научное обозрение. Биологические науки. – Россия, 2018. -№1. –С. 20-23 (03.00.00 №23). 4. Собитов Ў.Т. Мирзачўл воҳаси тупроқ қоплами трансформацияси // ЎзМУ хабарлари. – Тошкент, 2018. - №3/1. –Б. 201-203. (03.00.00 №9). II бўлим (II часть; II part) 5. Ш.Тешаев, Б.Холиқулов, Р.Қўзиев, Н.Абдурахмонов, А.Боиров, С.Арабов, Ў.Собитов, Ф.Тешаев, Ф.Намозов, Р.Хакимов, Ю.Саимназаров, М.Саттаров // Сирдарё вилояти тупроқлари ҳолати ҳамда унумдорлиги паст ерларда қишлоқ хўжалиги экинларини жойлаштириш ва етиштириш агротехнолагиялари бўйича тавсиялар. Тошкент, 2017, 64 бет. 6. Абдурахмонов Н.Ю., Собитов Ў.Т., Қ