Identification Code

PP00114

Project title

Study and forecast of soil water-salt regime and aeration zone infiltration (Yavan valley)

Project location

The Republic of Tadjikistan, Kurgan-Tube oblast.

Rubric

70.03.21

Rubric (SIC ICWC)

01.20.01.15

Project duration

1971-1975

Project manager

Olimov Kh. SPA "TadjikNIIGiM" The Republic of Tadjikistan, 734001, Dushanbe, Shamsi str., 5/1

Summary

Studies are dedicated to mechanism of water transporting in aera­tion zone, character of moistening and infiltration under irrigated fields, water and salt balances components, ground water regime, irrigation impact on reclamation state under developing and irrigat­ing subsiding new lands. According to climatic and soil conditions this valley can be di­vided into two parts. The first - north part area is 6 th.ha, the sec­ond - central and south parts area is 20 th.ha. Top soil of the north part is brown-carbonate, heavy loam and clay soil. There are strongly saline lands, sulfate-magnesium-sodium type. Zone with inflow from artesian water on depth 0-5 m and infiltration inflow zone - from 3 to 10m. In the central and south parts of valley soils are loam and sandy loam. Ground water table increases to pre-mountains, and from the north to the south part (from 1-3 m to 40-60 m). Salinity degree increases in the south direction. On the area 6 state farms are formed. Water supply is carried out through tunnel to two main canals (right and left branches), than machinery canals and farther flume canals. Distributors' efficiency 0.83. To fulfill study 4 key EPP were opted, where field observa­tions of all water balance components are carried out. Due to results of these studies measures set is developed on as­sessment of infiltration of aeration zone and ground water, water-reclamation measures set on increasing new irrigated lands, irriga­tion water and water saving as well as ways of obtaining design crop yield capacity.

Key words

Soils; loess; irrigation norm; ground water table; soil volume water capacity; infiltration; water balance; salt balance; cotton crop.   .

Bibliography

1 . Authors - Olimov Kh. Title - "Moistening dynamics under irrigated fields under thick aeration zone" Collection "Issues of reclamation and reclamation construction", Dushanbe, 1978 Data on intensity of wetting, infiltration of aeration zone and ground water table rising forecast. 2. Author - Aminjanov M.A. Title - "Water-salt regime of heavy soils in Yavan valley under irrigation" Papers of NII of Soil Science, Dushanbe, 1973, v.16. Ground water regime and salt balance of the north part of Yavan valley as well as salt removal from massif irrigated by drainage water are described.