@ARTICLE {SINGH:2003a, title = {Soil N balance as affected by soybean maturity class in the Guinea savanna of Nigeria}, author = {Singh, A. * and Carsky, R. and Lucas, E. O. * and Dashiell, K. }, journal = {Agriculture, Ecosystems and Environment}, year = {2003}, month = {December}, volume = {100}, number = {2-3}, pages = {231--240}, issn = {0167-8809}, }