@INBOOK {DIELS:2001a, title = {Options for soil organic carbon maintenance under intensive cropping in the West African savanna}, author = {Diels, J. and Aihou, K. * and Iwuafor, E. * and Merckx, R. and Lyasse, O. and Sanginga, P. and Vanlauwe, B. and Deckers, J. }, year = {2001}, type = {Integrated plant nutrient management in sub-Saharan Africa: from concept and practice.}, pages = {299--312}, publisher = {Wallingford, Oxon, UK: CABI}, }