Identification code

PP00101

Project title

Rational irrigation scheduling for rice in midstream of the SyrDarya river

Project site

Republic of Uzbekistan, SyrDarya province, Sayhunabad rayon, rice dehkan farm "Yangiabad"

Rubric

70.21.33

Rubric SIC ICWC

01.20.05.13

Project duration

1975-1990

Project manager

M. Khamidov, TIIMSH Kary-Niyazov 39, Tashkent, 700000, Republic of Uzbekistan

Summary: 

Objectives: to develop a set of measures on water use improvement in rice fields through rational irrigation scheduling, rational rice irrigation technique and technology, optimal rates and schedule of leaching, and water, temperature, and salt regimes management. Natural and economic characteristics of given plot are typical for 60% of rice area in midstream of the SyrDarya river. Climate is sharply continental. Relief is smooth. Soil texture shows loam and sandy loam followed by fine silty sands. Water table is 0,5-1,0 m (during growing period) and 1-2 m (autumn and winter period). Groundwater salinity is 1-5 g/1, while chemical composition is sulphate-chlorid. Irrigation system includes on-farm concrete coated distribution canal and earthern canals with specific length of 30 m/ha and efficiency of 0,51. The plot is equipped with open-channel drainage. Drainage depth is 1-1,5 m, while drain spacing is 300-400 m, and specific length of drainage is 30-40 m/ha. As a result a set of measures on irrigation improvement in rice fields was developed. This set of measures provides high cost-effectiveness of agricultural production and effective water and land resources use. Implementation of such measures made it possible to increase rice yield by 1-2 t/ha under irrigation norm of 24-26 thousands m3/ha. That is 1.5-2-fold less than current norms. Considerable improvement of water use efficiency led to favorable changes in environmental and reclamation conditions of the area.

Key words

irrigation schedule; soil moisture; flood irrigation; leaching requirements; water allowance; rice

Bibliography

1 . M.Khamidov, F.A.Barayev "Issues connected with the application of highly efficient, competitive and cost-effective water saving technologies and reclamation measures on irrigated lands", TIIMSH transactions, Tashkent, 1996 The paper shows results of field studies on the development of water saving irrigation regimes and technologies for various areas of Uzbekistan. 2. F.A.Barayev "The water saving technology for rice irrigation", Tashkent, Mekhnat, 1989. The paper states the current state of irrigation and reclamation on rice • systems, gives theoretical base for rationalizing the rice irrigation schedules, the rice fields layout.