@ARTICLE {IBEWIRO:2000b, title = {Nitrogen contributions from decomposing cover crop residues to maize in a tropical derived savanna}, author = {Ibewiro, B. and Vanlauwe, B. and Sanginga, P. and Merckx, R. }, journal = {Nutrient Cycling in Agroecosystems}, year = {2000}, volume = {57}, pages = {131--140}, }