Manu, A. and Bationo, A. and Geiger, S.C.
(1991)
Fertility status of selected millet producing soils of West Africa with emphasis on phosphorus.
Soil Science , 152 (5).
pp. 315-320.
Abstract
Millet (Pennisetum americanum) producing soils of West Africa were sampled at selected locations throughout the Sudano-Sahelian agroecological zone. The nutrient status of these soils was determined and related to P dynamics. Soils were neutral to acid in reaction, but few had any measurable amounts of exchangeable Al. Total P, Bray 1 extractable P, and P adsorption maxima were low which reflected their low levels of clay and organic matter. Phosphorus sorption characteristics were controlled by the poorly crystalline Al and Fe phases and the soil clay fraction. The poorly crystalline Al and Fe phases were highly correlated with the clay fraction. The P external requirement ranged from 11 to 40 mg P/kg soil. Given the low levels of total and labile P and the low fixation capacity of these soils, low to moderate levels of P amendments are necessary for sustained productivity.
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