Characteristics of older granite derived soils as affected by vegetation and slope, Nigeria
1993
Jaiyeoba, I.A. (Ahmadu Bello Univ., Zaria (Nigeria). Dept. of Geography)
Some physical and chemical properties of soils derived from Older Granite located at different bioclimatic environments and slope conditions in northern Nigeria were examined with a view to evaluating the pedogenic significance of vegetation and slope. The soil profile reflects the character of the soil forming material and an active denudational system. Texturally, the surface soils are rarely heavier than a sandy loam but subsoils are generally enriched with some clay to give fine loamy soils. The nutrient contents are low and the soil reaction weakly to moderately acidic. There is a clear tendency for the soils to become less coarse, higher in organic matter content and to be characterized by more base desaturation under Forest than under Savanna. Similarly, on particular slopes, there is a tendency for the texture to become less coarse and to be higher in organic matter content and nutrient elements as one moves downslope.
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