HYDRO-MODULAR ZONING OF IRRIGATED LANDS IN SOUTH KARAKALPAKSTAN AND OPTIMAL IRRIGATION REGIME FOR COTTON

Аннотация

The article presents the results of research on hydromodular zoning of irrigated lands based on GIS technologies, as well as cotton irrigation regimes in the conditions of South Karakalpakstan, which ensure an increase in the productivity of scarce irrigation water. Irrigated lands of the southern districts of the Republic of Karakalpakstan belong to one soil-climatic zone - desert zone, three soil-ameliorative areas within this zone. Irrigated lands of the southern districts of the Republic of Karakalpakstan are divided into 25.78% - VII, 34.37% - VIII and 21.86% - IX hydromodule zones in the aeration layer according to soil thickness, mechanical composition, location and groundwater level. Based on field experiments, the pre-irrigation of cotton in all hydromodule regions is to maintain soil moisture at 70-80-60% relative to the ChDNS: in the hydromodule region it is recommended to irrigate with 2789-2867 m3 / ha seasonal irrigation norms in 1-2-1 system and in IX hydromodular region with 2203-2250 m3 / ha seasonal irrigation norms in 0-3-0 system.