Abstract
Traditional polyculture is giving way to monoculture in the cassava-growing areas of Nigeria. Soil erosion was low when the traditional polyculture cropping system was adopted, and hence the impact of different cassava (Manihot esculenta) planting practices - on ridges, mounds or flat ground - in terms of soil conservation received little attention. This study concerns a comparison of erosion between monoculture and polyculture systems, and an assessment of the planting practices in reducing erosion under monoculture. The results from monitoring soil loss on six run-off plots show that soil erosion increases when traditional cassava polyculture is changed to monoculture practices. Moreover, the traditional cassava planting practices, found to be highly successful in reducing soil erosion under polyculture, are less effective when used in monoculture. The planting of cassava on flat surfaces proved the least effective in reducing soil loss; ridging across the slope was found to be the most effective.
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