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Soil salinity manаgement manual | Part I.Soil salinity management in the Eurasian Region
pastures is paid back in 4-5 years. Such artificial pastures maintain a high productivity for 20-35
years if used rationally.
In semidesert regions soil moisture reserves
are quickly depleted, where snow is removed from mown
areas by wind action. This is often the main reason for decreased yields of green biomass and hay.
Therefore, to create
Kochia prostrata grasslands for
harvesting hay and seeds, it is recommended
to subdivide a field into 3-4 parts that can be used in turn year by year, i.e., to create a rotation of
Kochia prostrata within
an irrigated field (http://cac-program.org/news/ detail/450)
The complete germination of sown seeds on the experimental
Artemisia-ephemeroid pastures was
due to natural irrigation in spring by water from melted snow and mud-flows descending from
mountains down to piedmont plains.
In the mountain foot-hills there are many sources of water that can be potentially used for irrigation:
melt-water, water of permanent and
temporary mountain streams, small rivers and, if required,
water from artesian wells.
In practice, good results were obtained by the construction of water-
collecting pools, where the collected water can be held for a day to allow it to warm up and purify
as sediment particles sink to the bottom prior to being used for the irrigation of fields.
Irrigated plant nurseries (seed isles) were created near the Tutli village in the
area of Nurat city in
the Navoiy Region (Uzbekistan). The plants grown with the help of local female farmers included
Kochia prostrata, Agropyron sp.,
Halothamnus subaphyllus and leguminous herbs (
Onobrychis sp.,
Medicago
sativa, Melilotus sp.,
Trifolium sp., etc.). Perennial species produced seed during the second year of
growth, with irrigation applied once or twice over a whole growing season.
Fresh biomass and hay yields in the first year of plant growth within the irrigated area were 10-20%
higher than those on non-irrigated fields on same soils and under the same climatic conditions.
Plants can be sown in wide or narrow rows as pure or mixed cultures. Sometimes,
check-row
planting, transplanting (fodder species of desert shrubs and small shrubs) or rootstock propagation
(perennial grasses) can be practiced.
Conclusion
Soil degradation under the impact of salts is the most important negative factor that limits the
efficient use of land resources. As a result of progressive soil salinization, some agricultural lands
have become unsuitable for normal use.
The first and foremost objectives of biosaline agriculture in arid regions include restoration of salt-
affected lands, creation of highly productive agricultural biocenoses in place of formerly degraded
ones, their inclusion
into agricultural use, the improvement of the ameliorative state and fertility
of soils.
Soil rehabilitation by the use of halophyte species is an effective way to both productively utilize
and desalinize salt-affected soils that are unsuitable for traditional agricultural crops.
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