Knowledge Base

Identification Code


Project title

Experimental site of rice irrigation system in Karakalpakstan

Project location

The Republic of Uzbekistan, Karakalpakstan, Tahtakupir rayon, state farm "Soviet Uzbekistan"



Rubric (SIC ICWC);

Project duration


Project manager

A.Nabiev, SPA SANIIRI, Uzbekistan, 700187, Tashkent, Karasu-4,11


Study is devoted to development of set of measures on water use improvement and combat soil salinization based on land drainability increase and leaching through open and subsurface drainage; to reveal reclamation efficiency and workability of this type of drainage in multi-layer soils, soil water-salt regime management. Farm locates in salt accumulation zone. Relief is smooth. Soils are from strongly to slightly saline chloride-sulfate and sulfate-chloride type. Ground water table is 1.3-1.5 m (spring) and 1.8-2.5 m (autumn). Total area is 145ha. Subsurface drainage length is 1774 m, open drainage-3510 m. Drain depth is 2m, spacing-206-230m. Irrigation network is earthen; irrigation technique-flooding. As result of research set of measures providing irrigated lands and irrigation water productivity as well as farm profitability increase is developed. Due to two-fold regulation of ground water table and water-salt regime water was saved in amount of 5500-7900cu.m/ha or on average 24.24% per hectare.

Key words

Soil salinization, ground water table, desalinization, water-salt regime, irrigation water, leaching, rice system, water consumption, rice, water balance, drainage outflow, salinity


1. Author: A.Nabiev Title: "Efficiency of subsurface drainage on rice irrigation systems", SANIIRI, 1984 2.Author: A.Nabiev, Title: "Modern rice systems with subsurface drainage" Results of experimental investigations are presented and recommendations given for irrigation norm and depth on background of open and closed drainage.