@INBOOK {POKU:1991, title = {Maize response to fertilizer in the Center Province, Cameroon: a methodological case study}, author = {Poku, J. and Baker, D. }, year = {1991}, type = {On-farm research in theory and practice, edited by H.J.W. Mutsaers and P. Walker}, pages = {128--138}, publisher = {International Institute of Tropical Agriculture (IITA)}, address = {Ibadan, Nigeria}, }