@BOOK {MULONGOY:1993a, title = {Soil organic matter dynamics and sustainability of tropical agriculture}, editor = {Mulongoy, K. and Merckx, R. }, booktitle = {Soil organic matter dynamics and sustainability of tropical agriculture}, year = {1993}, publisher = {John Wiley & Sons with Sayce Publishing (UK), the Catholic University of Leuven (Belgium), IITA, Ibadan}, address = {Ibadan, Nigeria}, }