@ARTICLE {YUSUF:2009a, title = {Grain legume rotation benefits to maize in the northern Guinea savanna of Nigeria: fixed-nitrogen versus other rotation effects}, author = {Yusuf, A. A. and Iwuafor, E. * and Abaidoo, R. and Olufajo, O. * and Sanginga, N. }, journal = {Nutrient Cycling in Agroecosystems}, year = {2009}, volume = {84}, pages = {129--139}, issn = {1385-1314}, }