| |
Identification
code |
PP00073 |
Project
title |
Development
of drainage types and structures for soil desalination and
further salinization prevention in order to use return waters |
Project
site |
Republic of Tadjikistan, Leninabad province, Isfara rayon |
Rubric |
70.03.17;
70.03.21 |
Rubric
(SIC ICWC) |
01.20.01.13;
01.20.01.15 |
Project
duration |
1989-1993 |
Project
manager |
D.I. Davlyatov, Scientific Production Association “TadjikNIIGiM”
Shamsi str.,
5/1, Frunzensky district, Dushanbe, Republic of Tadjikistan |
Summary: |
The
research deals with the salinity control and the soil and
water productivity increase through improved drainability
and leaching. The objective is to justify measures on the
improvement of water use and management by soil water-salt
regime under conditions of fresh river water shortage, to
develop and justify drainage types and structures in order
to use return waters in irrigation.Environment conditions
of the pilot plot are typical for the most part of Isfara-Lyakkan
valley, which is an inter-mountainous hollow. The plot
is located in a zone of salt accumulation, in the middle
right-bank part of Isfara river. Relief is smooth. The climate
is sharply continental. Lithology: loam
and sandy loam in upper layer with clay interlayers; thickness
is 0,5-3,7 m. Soils are medium and high saline. Ground waters
are bedded at a depth of 1-2 m. Weighted average salinity
of ground waters is 1,2-5,0 g/l. Area of the plot is 20
ha.Subsurface horizontal
drainage is constructed on the plot. Drain spacing is 120
m, while drain depth is 2,2-2,4 m.
The research
resulted in the development of a set of technical reclamation
measures and the recommendations on the improvement of the
reclamation state of Isfara-Lyakkan valley. |
Key
words |
Soil
salinization, groundwater, return water, salt balance, infiltration,
drainage |
Bibliography |
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