Scaling-up and -out of fertilizer microdosing and "warrantage" or inventory credit system to improve food security and farmers´ income in West Africa - Tabo, Ramadjita; Bationo, B. André; Amadou, B.; Lompo, F.; Gandah, M.; Hassane, O; Dougbedji, F; Sako, K.; Ndjeunga, J; Koala, Saidou (International Center for Tropical Agriculture, 2007)