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Somado, E A and Sahrawat, K L and Kuehne, R F (2006) Rock phosphate-P enhances biomass and nitrogen accumulation by legumes in upland crop production systems in humid West Africa. Biology and Fertility of Soils, 43 (1). pp. 124-130. ISSN 0178-2762
Somado, E A and Becker, M and Kuehne, R F and Sahrawat, K L and Vlek, P L G (2003) Combined Effects of Legumes with Rock Phosphorus on Rice in West Africa. Agronomy Journal, 95 (5). pp. 1172-1178. ISSN 1435-0645