Project Manager |
A.R. Ramazanov, SPA SANIIRI
The Republic of Uzbekistan, 700187, Tashkent, Karasu-4/11 |
Summary |
Investigations on improvement of water use
and soil water-salt regime management, irrigated lands productivity
increase were carried out in the rice sowing zone of Amudarya
low reaches. Territory is located in the North of AmuDarya
delta and presented mostly by strongly saline meadow-desert
soils. Soils made of clay, loam, clayey sand and sand. Climate is sharply continental. Before rice irrigation systems construction
the ground waters with mineralization 0.3-30 g/l were at
a depth of 3 -10 m. Experimental Production Plot area is
45 ha. Land use efficiency is 0.71 - 0.83. Over the plot
territory the gauging stations, observation wells and piezometers
are installed. Instrumental survey of canals and distribution
network and salt survey were conducted. After 4-years rice
irrigation the salt content in thickness 0 - 3m was 0.23
- 0.42 % and 0.02 -0.07 % - on chlorine-ion. Salt balance
of aeration zone was of desalination type. Under basic mineralization
of ground water 18.6 - 44,6 g/l after second year of irrigation
it decreased to 7 - 22.8 g/l. At the end
of vegetation after 4-year rice cultivation the ground water
mineralization was within 7.2 -11.2 g/l. Significant salt
quantity from rice irrigation systems territory is removed
by drainage outflow. Minimum value of drainage water mineralization
(0.76 - 3.22 g/l) was noted in the period of water release
from rice fields (June-September). After water release from
rice fields at the end of vegetation the salt content in
drainage outflow increases (9.49 -11.89 g/l) that is due
its formation by inflow from distribution network and saline
ground water. Moisture content in thickness 0 - 40 cm before
rice sowing was 15,65 % (first year); 14,4 % (fifth year);
in thickness 40 -100cm - 22,4 and 24,1 % from soil weight
accordingly. After rice harvest it was 25,0 -23,8 (0 -40
cm) and 27,3 -24.1 % (40 -100 cm). In the thickness 100
-150cm soil moisture was 22,8 -24,0 % (spring) and 27,5
-26,5 % (autumn). |
Bibliography |
1. Authors: A.R.Ramazanov, A.R. Kurbanbayev, Kh.I.
YakubovTitle: Some issues of Amudarya low uppers reclamation
Nukus, "Karakalpakstan", 1978
Monograph includes main results of ecologic-reclamation
process research under different crops irrigation development
and presents technical and technological recommendations
on their management. |
