Project manager |
N. Gaipnazarov., SPA SANIIRI
The Republic of Uzbekistan, 700187, Tashkent, Karasu-4/11 |
Summary |
Investigations related to revelation of the main reasons
of irrigated lands and irrigation water productivity decrease
by means of system analysis of irrigated farming which allows
to develop the set of water-reclamation and agro-technical
recommendations on irrigated lands and irrigation water
productivity increase. Experimental plot is located in
middle stream of Syrdarya river. Climate is sharply continental. Ground water depth
from 1,5-4m. Ground water salinity is within 5-20 g/l of
chloride-sulfate type. In old irrigation zone (Shuruzak,
Sardoba, Bayaut massifs) vertical drainage is operated.
306, 184 and 109 wells are built correspondingly. Collector-drainage
system specific length is 26,1, 42,3 and 21,4 m/ha respectively,
in Poimen massif -27 m/ha. Irrigation network (76-82%) in
earth channel. Inter-farm canals efficiency is 0,94-0,96
and on-farm-0,7-0,73. In new irrigation zone (Central, Farhad,
Djizak and other massifs) subsurface drainage with specific
length 57,5; 94,4; 107; 42 m/ha, respectively, is operated.
Irrigation system is lined. Inter-farm canals efficiency
is 0,9-0,98 and on-farm efficiency -0,83-0,86.
Analysis of dynamics and tendency of reclamation processes
is conducted. Assessment of impact of water-reclamation
and agro-technical factors on agriculture crop yield capacity
is given. Recommendations including set of water-reclamation
and agro-technical measures, directed to irrigated lands
and irrigation water productivity increase, were developed. |
Bibliography |
Author - N. Gaipnazarov Title - “Dynamics of reclamation processes on Shuruzak
massif of Hunger steppe”Collection of the scientific-technical reports, Fergana,
1997Analysis of dynamics of reclamation processes on Shuruzak
massif during 1986-1996 is conducted. Causal connections
of water availability-land drainability-ground water table
indicators were established. Secondary salinization due
high ground water table because of poor operation of drainage
as well as lack of water supply under deep ground water
table i.e. salt leaching regime absence is found.
Relations between dynamics of reclamation processes
and cotton crop yield capacity are defined. |
