@ARTICLE {VANLAUWE:2005a, title = {Long-term integrated soil fertility management in south-western Nigeria: crop performance and impact on the soil fertility status}, author = {Vanlauwe, B. and Diels, J. and Sanginga, N. and Merckx, R. }, journal = {Plant and Soil}, year = {2005}, volume = {273}, number = {1-2}, pages = {337--354}, issn = {0032-079X}, }