Studies have found that the sub-surface method of winter wheat irrigation halves the number of irrigations and reduces the crop water consumption by 970-1015 m3, inter-row treatment procedures, and the consumption of fuels and lubricants. The productivity of winter wheat grain in comparison with the control (without sub-surface irrigation) is increased by 0.9 t/ha, environmental pollution from agrochemicals is prevented. The sub-surface irrigation method in conditions of meadow soils with a groundwater level of 1-3 m and mineralization of 1-3 g/l experimented in this paper and the influence of this method on the development dynamics of winter wheat (Polovchanka) on obtaining high yields was also tested. The number of irrigations increased to 6-7 times instead of 3-4. Therefore, on such lands, we recommend while designing the drainage system, the designers should plan the depth of the drains no more than 1.5 meters. Sub-surface irrigation is a temporary closure of closed drainage during the growing season of winter wheat, leading to an increase in groundwater level (80-130 cm), thereby leading to an increase in the moisture reserve in the soil.

The article describes the monitoring and calculations for the repair and maintenance of the “Sarchali” canal. At present, it is reported that the value of available water resources is high due to the annual decrease in irrigation water. Effective use of irrigation canals in the supply of water to the Water Consumers Association is one of the urgent tasks. During the field surveys, the current condition of the canal and the technical condition of the hydraulic structures in it were fully monitored, and as a result of many years of field data, the operation of the canal was analyzed. From the scientific point of view, the conclusion was made on the repair of the canal and its hydraulic structures or the construction of new hydraulic structures. The current condition of the Sarchali canal along the entire length of the canal was studied in the field, and based on the results of the study, it was determined to repair the canal or build new facilities.

In this article, stratified feeding of Bukhara-102 variety of medium-fiber cotton with mineral fertilizers were carried out in the conditions of irrigated and fertile soils of Kashkadarya province. Simultaneously, compared to the studied fertilizer application options, there was a decrease in soil volume by 0.01–0.02 g/cm3, an increase in soil porosity by 0.4–1.2%, and an increase in soil water permeability to 5.8–24.6 m3/ha. Moreover, an additional yield of 1.3–2.6 quintals of cotton, the quality indicators of fiber length that increased by 0.1–0.2%, fiber yield to 0.2–0.5%, the weight of 1, 000 seeds to 1–2 grams , the incidence of Wilt's disease was found to become as low as 6.1–10 %. At the same time, with increasing salinity in the care of saline soils at different levels, the net profit was around 40, 617 - 1, 127, 853 UZS and the profitability rate was 0.8-20.1% lower than expected.

In this paper, the approach to reduce the risk of irrigation erosion in the irrigated areas where ‘Andijan 37’ and ‘Namangan 77’ varieties of cotton were sowed, in which the topsoil is formed by typical gray soils and which are vulnerable to erosion, was validated. In cotton irrigation, while watering with a device with a 15 mm of irrigation hollow, the cotton water-demand was improved and an optimal and favorable condition to uptake the potential moisture and nutrient for cotton breeding was created. This enabled to harvest 3.6 quintals more cotton yield per ha in contrast to the usual condition, to gain the net profit accounted for 700,309 sums per ha, and to improve the profitability by 38%.

The most suitable arable land for viticulture is mainly located in the rain-fed areas such as in the foothills and mountainous regions of Uzbekistan where vineyards reach the acme point of the yield productivity. Irrigating with rainwater in the vineyard has a great potential for obtaining stable yields at the low cost of irrigation water which is proven by experimental and theoretical studies. This paper aims at implementing and testing the advantage of sustainable irrigation methods in water-scarce regions of Uzbekistan by scrutinizing the hydraulic characteristics of irrigation water and slope of the study area. We considered the maximum evapotranspiration rate in general for all phases to calculate the amount of irrigation water required per one vine tree since considering the water scarcity in the maximum growing season is important. We firstly aimed at constructing the pool to store raindrops. To perform this, we used the laser level for checking land suitability and a standardized 20 Ø irrigation pipe to deliver rainwater from the pool to the furrows of the vineyard. The results of the geodetic survey showed that the average slope of the pilot area was equal to 0.022 and enabled to implement the rainwater irrigation.