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Essay On Soil Erosion

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Soil erosion poses a significant threat to the environment and agriculture. The repeated loss of fertile topsoil negatively affects the long term sustainability of natural systems. Agricultural productivity faces a significant decline as a result of soil erosion Kusimi et al., (2015). Agricultural land across the world has either been lost or is rapidly experiencing degradation as a result of soil erosion. According to Arekhi et al., (2012), close to 40% of the world’s agricultural land is degraded, this includes 65% for Africa, 74% and 45% for North and South America respectively. Notable is that soil loss by erosion is an ongoing process, it was earlier reported by (Dudal 1981) that, across the globe , approximately 6,000,000 ha of fertile …show more content…
Soil erosion therefore is a critical environmental problem across the world, it is also one of the most important environmental problems in Southern Africa. South Africa (SA) is compounded by various forms erosion which makes it complicated to contain the problem. More than 70% of SA is affected by various intensities of erosion (Garland et al., 2000). The intensity of soil erosion is accelerated by the degree of slope, slope increases the velocity of flow and thus the power of runoff to detach and transport sediment into valleys and streams (Pimentel and Burgess, 2013). Erosion in semi-arid Southern African countries is mainly caused by water and wind. Although close to 25% of SA is affected by wind (Hoffman and Todd, 2000), most erosion problems across the country are related to soil erosion by water. Water erosion outcomes such as the amount of soil eroded , transported and delivered at the outlet of channels depends on the combination of factors such rainfall erosivity, soil erodibility, slope steepness and slope length, crop management and support practice factor (LeRoux et al,

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