Abstract
A detailed soil survey of the lower N'gell valley, N Nigeria had previously been completed and the results presented as major soil groups. This paper describes how, on the basis of seven measures of soil fertility, these were evaluated to produce soil fertility maps. The maps focus attention on those chemical properties most directly related to soil fertility and the management of crops in the field. They may be used as an interpretive classification in conjunction with the original soil map, and as guides to the factors which need urgent attention.
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