NOVATEUR PUBLICATIONS INTERNATIONAL JOURNAL OF INNOVATIONS IN ENGINEERING RESEARCH AND TECHNOLOGY [IJIERT] ISSN: 2394-3696 VOLUME 7, ISSUE 5, May.-2020 318 | Page BALANCES OF SOIL WATERS OF COTTON ROOTABLE LAYER IN EXPERIMENTAL PRODUCTION SECTIONS OZATBOY BAZAROVICH IMAMNAZAROV, Associate professor, Ph.D. TOKHIRJON OLIMJONOVICH QOSIMOV, Senior Lecturer MAKHAMMADALI RUSTAMJONOVICH ABDULLAEV Lecturer, Namangan engineering-construction institute ozodbekimomnazarov@gmail.com ABSTRACT Regulation of the soil water balance item is the basis for creating optimal parameters for the reclamation regime ensuring a high crop yield. The values of the water balance item are determined using various formulas recommended by various researchers. Each formula, before applying, must be clarified for specific climatic conditions. With close occurrence of groundwater to the surface of the earth, euotranspiration increases. The main reason for the increase in euotranspiration is an increase in the recharge of the active soil layer by groundwater. KEYWORDS: soil water balance, water balance items, active soil layer, groundwater, groundwater recharge, evapotranspiration. INTRODUCTION: As you know, the water-salt balances of irrigated lands are the basis of any irrigation and drainage measures, since we regulating balance sheet items with the help of hydraulic structures, we improve the reclamation state of irrigated lands. Our studies have shown that when fresh and weakly mineralized groundwater occurs close to the surface of irrigated lands located on the right-bank floodplain terrace of the Syr Darya river, a small amount of salts accumulate in the soil, which is washed back from the soil into groundwater or underlying layers by pre-arable or moisture-recharging irrigation and atmospheric precipitation in the autumn-winter period. Therefore, when substantiating the applicability of various irrigation and drainage measures at the research object aimed at creating ameliorative and favorable conditions, it is enough to establish the parameters of hydraulic structures based on the water balance creating a condition that allows rational and efficient use of water and land resources. The main condition for the rational and efficient use of land resources is the creation of an optimal reclamation regime in the active soil layer. The optimality of a reclamation regime cannot be determined without determining the water balance in the active soil layer. To conduct field research, six pilot production sites were organized on light and medium loamy soils. Each experimental production site has four replicates. The quantitative values of the items of the water balance of the root layer of the soil were determined in all experimental production sections of soils with different mechanical composition. The following water balance equation was used:  ௞ = ு + ∆ + ܣ ଴ + ௣ + ݍ− ܧ(1) Where,  ு ,  ௞ is the moisture reserve in the calculated soil layer at the beginning and end of the calculation period, m 3 /hа; ∆ - moisture supply in the layer of growth of the root system of plants, m 3 /hа; The moisture supply in the growth layer of the root system for the billing period was determined by the formula of S.F. Averyanov: ∆ = ПВට1 − ௛ ு кп ൤1 − ቀ ППВ ПВ ቁ ଶ ൨ (2) Where h is the distance from the groundwater level to the middle of the growth of the root system for the billing period, m; ܪ кп ; - the maximum height of the capillary rise, m [1]. Its value is determined by the plot of soil moisture. It is 1.97 m for light loamy soils, and 2.63 m for medium loamy soils.