@INBOOK {CARSKY:1997b, title = {Benefits of crop rotation with soybean and cowpea in savanna cereal based systems}, author = {Carsky, R. and Berner, D. K. }, editor = {Bezuneh, T. and Emechebe, A. and Sedgo, J. and Ouedraogo, M. }, year = {1997}, type = {Technology options for sustainable agricultural production in sub-Saharan Africa}, pages = {391--402}, publisher = {OAU: STRC—SAFGRAD}, address = {Ouagadougou, Burkina Faso}, }