@INBOOK {SINGH:2001c, title = {Grain yield response of maize to previous soybean crop and residue management in the Guinea savanna of Nigeria}, author = {Singh, A. * and Carsky, R. and Lucas, E. O. * and Dashiell, K. }, year = {2001}, type = {Impact, challenges and west and central Africa: proceedings of the Regional Maize workshop, IITA, Ibadan, Nigeria, 4-7 May, 1999}, pages = {214--224}, }