@ARTICLE {JAGTAP:1999a, title = {Nutrient recovery and productivity of a soybean-maize rotation in the derived savanna ecology of West Africa}, author = {Jagtap, S. and Adeleye, O. }, journal = {Journal of Sustainable Agriculture}, year = {1999}, volume = {15}, number = {1}, pages = {75--86}, issn = {1044-0046}, }