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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. ISSN 0038-075X
Geiger, S C and Manu, A and Bationo, A (1992) Changes in a sandy sahelian soil following crop residue and fertilizer additions. Soil Science Society of America Journal, 56 (1). pp. 172-177. ISSN 1435-0661
Geiger, S C and Manu, A and Vandenbeldt, R J (1994) Variability in the growth of faidherbia albida: The soils connection. Soil Science Society of America Journal, 58 (1). pp. 227-231. ISSN 0361-5995