Over grazing
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The grazing pressure on grasslands is very high. In semi arid areas, carrying capacity in good range land is 1 adult cow unit (ACU) /ha but the actual pressure is 3.2 ACU/ha. But in arid areas, carrying capacity is 1 - 4 ACU / ha as against the actual pressure of 0.2 - 0.5 ACU / ha.
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Due to over grazing run off and soil erosion are high. Results from IGFRI indicated that there was 41% run off from bare soil where as in the improved grass land vegetation, the run off was only 6.5 %. Over grazing also results in a shift in the natural succession (as seen in 3 d). Over grazing also results in greater run off and soil loss. Eg.
Results from IGFRI, Jhansi (96 -97)
- Total quantum of water received through rainfall - 6035 cum/ha
- Grazing pressure 1.5 ACU/ha. in grazing systems
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Grazing system
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Total run off (cum/ha)
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Soil loss (t/ha)
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Run off Co eff (%)
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Rotational grazing
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376
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0.17
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6.2
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Differed grazing
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423
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0.26
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7.0
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Continuous grazing
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457
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0.46
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7.5
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Cut and carry system
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383
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0.13
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6.3
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Bare plots
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1173
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0.68
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19.4
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Last modified: Thursday, 24 November 2011, 9:17 AM
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