@INPROCEEDINGS {DEFOER:1998b, title = {Towards integrated soil fertility: experiences from southern Mali}, author = {Defoer, T. and Kante, S. and Hilhorst, T. and De Groote, H. }, editor = {Bezuneh, T. and Ouedraogo, S. and Menyonga, J. M. and Zongo, J. D. and Ouedraogo, M. }, booktitle = {Towards sustainable farming systems in Sub-Saharan Africa: proceedings of the Second International Symposium of the African Association of Farming Systems Research-Extension and Training (AAFSRET), Ouagadougou, Burkina Faso, 21–23 August 98}, year = {1998}, pages = {27--48}, publisher = {African Association of Farming Systems Research-Extension and Training (AAFSRET)}, address = {Ouagadougou, Burkina Faso}, }