@INBOOK {SCHULZ:2001, title = {Herbaceous legumes: the panacea for West African soil fertility problems?}, author = {Schulz, S. and Carsky, R. and Tarawali, S. }, year = {2001}, volume = {58}, type = {Sustaining soil fertility in West Africa.}, pages = {179--195}, publisher = {Soil Science Society of America (SSSA); American Society of Agronomy}, address = {Madison WI, USA}, }