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Definitions of SWC measures
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Agronomic
measures
such as mixed cropping, contour cultivation, mulching, etc. which:
- are
usually associated with annual crops
- are
repeated routinely each season or in a rotational sequence
- are
of short duration and not permanent
- do
not lead to changes in slope profile
- are
normally independent of slope
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Vegetative
measures such as grass strips, hedge barriers, windbreaks, etc.
which:
- involve
the use of perennial grasses, shrubs or trees
- are
of long duration
- often
lead to a change in slope profile
- are
often zoned on the contour or at right angles to wind direction
- are
often spaced according to slope
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Structural
measures such as terraces, banks, bunds, constructions, palisades,
etc. which:
- often
lead to a change in slope profile
- are
of long duration or permanent
- are
carried out primarily to control runoff, wind velocity and erosion
- often
require substantial inputs of labour or money when first installed
- are
often zoned on the contour / against wind direction
- are
often spaced according to slope
- involve
major earth movements and / or construction with wood, stone,
concrete, etc.
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Management
measures such as land use change, area closure, rotational grazing,
etc. which:
- involve
a fundamental change in land use
- involve
no agronomic and structural measures
- often
result in improved vegetative cover
- often
reduce the intensity of use
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Combinations
in conditions where different measures are complementary and thus
enhancing each other. Any combinations of the above measures are
possible, eg:
- structural:
terrace with
- vegetative:
grass and trees with
- agronomic:
ridges
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