Scientificly Based Irrigation Procedure of Cotton and Winter Wheat in Different Soil and Hydrogeological Conditions of the Kashadarya Region of Uzbekistan

Abstract

Abstract The purpose of this article is to analyze the monitoring data of irrigated land in the agrometeorological conditions of Kashkadarya region and CropWat 8.0. is to estimate and compare actual daily evapotranspiration (ETo) and seasonal irrigation rates of cotton and spring wheat using the model. These studies were conducted in experimental fields located in the main agricultural production zone of Kashkadarya. At the time of global climate change, and in order to prevent the decrease in the yield and quality of agricultural crops due to the lack of irrigation water compared to the crop demand, taking into account the water demand of cotton and winter wheat grown in Kashkadarya region, using the weather station data, the seasonal irrigation standard FAO methodology using the CropWat 8.0 program, the mechanical composition of the soil, the depth and mineralization of seepage water, and the values of the plant coefficient for the stages of cotton development were determined. In addition, scientifically based irrigation methods of water-saving irrigation technology of cotton and winter wheat were developed for the conditions of the Kashkadarya region according to the generally accepted hydromodule regions. Based on the developed software, the seasonal irrigation norms of cotton and winter wheat were 3500–6900 (cotton) and 2000–3400 (winter wheat) m3/ha in hydromodule regions. These values were compared with the results obtained from field experiments. The results of the study showed that the ETo values calculated by the method based on the CropWat model compared with the values obtained from field experiments, the difference was ± 8–10%.