@INBOOK {VERSTEEG:1991, title = {Trial design and analysis for on-farm adaptive research: a 1988 maize trial in the Mono Province of Benin}, author = {Versteeg, M. and Huijsman, A. }, year = {1991}, type = {On-farm research in theory and practice, edited by H.J.W. Mutsaers and P. Walker}, pages = {111--121}, publisher = {International Institute of Tropical Agriculture (IITA)}, address = {Ibadan, Nigeria}, }