Efficient rainwater harvesting and nutrient management for high crop productivity in Volta Basin - Fosu, M.; Sawadogo-Kabore, S.; Bationo, B. André; Tabo, Ramadjita; Buah, Saaka S.J.; Bonzi, M; Fatondji, D.; Hassane, O; Abdou, A (CGIAR Challenge Program on Water and Food, 2008)