@INBOOK {PALADA:1991, title = {An on-farm rice variety trial in toposequences of inland valley swamps}, author = {Palada, M. C. and Walker, P. and Masajo, T. M. and Jallah, M. }, year = {1991}, type = {On-farm research in theory and practice, edited by H.J.W. Mutsaers and P. Walker}, pages = {147--154}, publisher = {International Institute of Tropical Agriculture (IITA)}, address = {Ibadan, Nigeria}, }