@INBOOK {KANG:1993, title = {Changes in soil chemical properties and crop performance with continuous cropping on an Entisol in the humid tropics}, author = {Kang, B. }, editor = {Mulongoy, K. and Merckx, R. }, year = {1993}, type = {Soil organic matter dynamics and sustainability of tropical agriculture}, pages = {297--305}, publisher = {John Wiley & Sons with Sayce Publishing (UK), Catholic University of Leuven (Belgium), IITA, Ibadan}, address = {Ibadan, Nigeria}, }