The article is devoted to the reconstruction of existing old drainage systems in order to radically improve the reclamation ecological and sanitary conditions of the lands of the Jizzakh region to improve the social conditions of the population and obtain high stable yields of cotton and other agricultural crops. As a result of many years of theoretical and irrigation to experimental research, operational monitoring in farms in the Pakhtakor district of Jizzakh region. The parameters of the primary horizontal drain are determined based on the analysis of reclamation climatic, soil, geological, hydrogeological, hydrological, economic, and other conditions. The calculation of the reconstruction of horizontal closed drainage is based on the method of A.N. Kostyakov in intensity from working the groundwater level after flushing. The depth of the drainage was determined, taking into account global climate change in recent years; based on these changes, an adjustment was made in the calculations to determine the value of the critical depths of groundwater during the operation of drainage systems. The incoming and outgoing parts of the water balance of the experimental plots were determined. In the presence of pressure groundwater, the size of the supply of groundwater with pressure water is determined. More proposed by the V.N. Shestakov's formula.

Salinization of land poses a serious threat and harms all industries, including the environment, agriculture, economy, and so on. In this regard, this topic is very relevant today. The object of the research is the agriculture of the Republic of Uzbekistan. The aim of the study is the impact of saline soils on agriculture in the Republic of Uzbekistan. The current state of reclamation systems, the processes of soil salinization and the quality of irrigation water, as well as the features of the manifestation of secondary salinization on irrigated lands are analyzed. Analysis, observation, grouping and many other methods were chosen as research methods. In the conclusions, proposals were made to reduce the amount of saline soils. Greater efficiency of reclamation measures can be ensured by the complex consideration of natural factors in the design and the complex impact on them during the operation of reclaimed lands.

The article presents theoretical and field experimental data on determining the rates of infiltration and filtration of irrigation water in the soil - grounds of the calculated layer in the cotton fields of the Dzharkurgan massif in the Surkhandarya region. Based on the established values of the rates of infiltration of irrigation water, the drip irrigation regime for cotton of the new Sultan variety has been determined, the parameters of the innovative drip irrigation technology have been determined.

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