@INPROCEEDINGS {OKOGUN: 1994, title = {Screeing of multipurpose trees for alley cropping on Alfisol and Ultisol}, author = {Okogun, J. and Mulongoy, K. and Odu, C. T. I. and Agboola, A. A. }, editor = {Sadiki, M. and Hilali, A. }, booktitle = {Recent development in biological nitrogen fixation research in Africa: proceedings of the 5th International Conference of the African Association for Biological Nitrogen Fixation (AABNF), 14-19 September 1992, Rabat, Morocco}, year = {1994}, pages = {551--562}, publisher = {Hassan II Institute of Agronomy and Veterinary Medicine}, address = {Rabat, Morocco}, }