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Identification
Code |
PP00169 |
Project
title |
Deep
non-sloping drainage effectiveness with water logged mouths |
Project
location |
Turkmenistan,
Charjow oblast, Charjow rayon, Ilyich's collective farm |
Rubric |
70.23.39 |
Rubric (SIC ICWC) |
01.45.01.10 |
Project
duration |
1987-1995 |
Project
manager |
Kalantayev
V.A., TurkmenNIIGiM Turkmenistan, 744012, Ashkhabad, Ostrovsky
str., 30 |
Summary |
Studies
are dedicated to determination of non-sloping drains constructed
in underlying soils and development of recommendations on
their construction and operation. Climate is continental,
dry. Relief is smooth. Soils - saline, salinity type is
sulfate-sodium-calcium. Ground water table is 1.6-2.0 m
(in growing period), salinity degree is 2.5-3.0 g/1 (autumn-winter),
salinity 1.0-10 g/1, salinity type - sulfate-chloride. EPP
area is 49.5 ha. Irrigation network - in earthen channel,
Collector-drainage network - open and closed. Results of
studies showed that deep non-sloping drainage with logged
mouths constructed in sandy soils gave opportunity to lower
more evenly ground water table and desalinize soils and
ground water, regulate GWT to optimal depth depending on
agricultural crops development stage, increase GWT lowering
rate after leaching and vegetation irrigation, increase
in 3-4 times drainage flow modulus as compared with drainage
constructed in melkozem. |
Key
words |
Non-sloping
drainage; ground water table; drainage flow; cotton |
Bibliography |
1.
Author - Kalantayev V., Demirov O. Title - "Non-sloping
drainage with water logged mouths" "Agriculture
of Turkmenistan", 1996, #1 In article data about non-sloping
drainage use in arid zone are given. It is showed that location
of non-sloping drains in sand thickness (under conditions
of two-layer soil) significantly exceeds water inflow in
them despite of mouths' water logging from collector. Theoretical
studies and field investigations showed that drains specific
length is reduced in 2-3 times in comparison with drains
constructed in melkozem. |
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