@INBOOK {MULONGOY:1990c, title = {Biological nitrogen fixation in alley farming}, author = {Mulongoy, K. and Sanginga, N. }, year = {1990}, type = {Transactioins, 14th International Congress of Soil Science, Vol. III Commission III, 12-18 Aug 1990, Kyoto, Japan}, pages = {326--327}, address = {Kyoto, Japan}, }