Investigations
related to adustment of methods of accelerated strongly
saline gypsym bearing soils desalinization by means
of capital leaching conduction through rice, irrigated
land productivity increase and water salt regime management
on a background of vertical drainage.
Relief
is hilly.
Ground
water level -3-3,5m, salinity -6-25 g/l.
Soils are
middle and heavy loam with gypsum layers, saline, chloride-sulfate
and sulfate-chloride type.
Area under
investigations is 3000 ha, from which under irrigation
- 1538 ha. Experimental plot area is 14 ha (accelerated
desalinization by means of capital leaching conduction)
and 297,5ha (desalinization through rice sowing, two
alternatives).
On plot
28 wells of vertical drainage are constructed.
Field investigations
and calculations showed that along with desalinization
water expenses for 1th of salt removal are sharply increase,
therefore, leaching of strongly saline hardly reclaimed
soils by norm more 12-13 th. m3/ha is not
expedient. Such soils desalinization should be conducted
gradually by autunm-winter leaching in combination
with leaching regime. Practical recommendations on
vertical drainage pumping regime planning taking in
to account ground water use for irrigation and methods
of accelerated soil desalinization are given. |
