Abstract
Variability of soil textural and chemical properties are compared for samples taken from two 100 m grids located in the upper and side slope land facets of the interfluves of a gently undulating plain in Mada plains, Northern Nigeria. The number of samples needed for valid generalizations of the soil conditions for each facet are given for four different levels of precision. There is considerable variability within and between the land facets. pH is the least variable, requiring the smallest sample size for estimation, while sodium with the greatest spatial variability requires the largest sample size for estimation.
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