Assessment of nutrient deficiencies in maize in nutrient omission trials and long-term field experiments in the West African Savanna - Nziguheba, Generose; Tossah, B.K.; Diels, J.; Franke, A.C.; Aihou, K.; Iwuafor, E.N.O.; Nwoke, C; Merckx, Roel (Springer, 2009)