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Chapter 5.Innovative methods and technologies for amelioration of salt-affected soils and agroforestry practices in marginal landscapes
http://www.cac-program.org/video/play/10
Irrigated agriculture systems using saline artesian water in Kyzylkum produce a net income of 12.5
million UZS per year.
Increases in
grazing pressure on Artemisia-ephemeroid pasture communities on grey-brown soils
results in the accumulation of chlorides and mixed chloride and sulphate salts and the loss of
humus,
total nitrogen, available phosphorus and potassium from the soil. Such consequences of
human impact on pastures are very undesirable, yet the cost of the rehabilitation of such
pastures
is extremely high.
Joint research by the ICBA-CAT and the Institute of Karakul Sheep Breeding and Desert Ecology
Research (Uzbekistan) has demonstrated that the productivity of degraded pastures can be
increased by 20-40% through the improvement of the surface layer of soil (half of the rooting depth)
under
Artemisia-ephemeroid communities on brown sandy soils. Surface improvement technology
implies the creation of alternating strips of ploughed and naturally vegetated soil within an area of
pasture. It has been applied on pastures in the areas of Karnabchul and Malikchul and piedmont
semidesert communities of the Nurat Mountains.
Areas of cultivated pasture with limited irrigation can be profitable in the piedmont and steppe
regions and on lower mountain slopes
in the south of Kazakhstan, the Chuy Valley in Kyrgyzstan,
the valleys of Zaravshan and Fergana in Uzbekistan and the Ashtsky Region in Tajikistan.
Experimental research sites were located on the most severely trampled semidesert and desert
pastures around human settlements, within small livestock farms, around artificial water reservoirs,
waterholes and shelters for sheep and cattle in piedmont and semideset regions.
The direction of ploughed strips is perpendicular to that of prevailing winds. Seed is usually
sown in December-January, to a depth of 1-2 cm in a dense bed. The use of fodder crop species
with different ecological and phytocenological characteristics is preferable for creating pasture
agrocenoses to be used all year round. Such species include trees (
Haloxylon aphyllum),
large shrubs
(
Salsola Richteri and Salsola Paletzkiana), medium shrubs (
Halothamnus subaphyllus), small shrub-like
herbs (
Salsola orientalis, Kochia prostrata, Camphorosma sp. and
Artemisia sp.) and grasses (
Poa bulbosa and
short-lived ephemeroids).
The creation of perennial pastures using desert and semidesert species of fodder crops
is achieved
by sowing seed within ploughed soil strips 12-60 m wide, with undisturbed natural pasture
vegetation strips 24-120 m wide left in-between. Seed is sourced from fodder plant nurseries (seed
isles) created on elevated open slopes with respect to prevailing wind direction and plant flowering
times. Ripe seeds are carried by the wind and are self-sown over distances of 50 to 100 m within a
pasture, thus, allowing for the self regeneration of pasture communities.
The net income from 100 ha of improved pasture is 4-6 times higher than
that from an equal- sized
area of natural Artemisia-ephemeroid pasture. Capital investment into creation of artificial
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