@ARTICLE {VAN ASTEN:2004c, title = {The effect of irrigated rice cropping on the alkalinity of alkaline soils in West Africa}, author = {Van Asten, P. and Van 't Zelfde, A. and Van der Zee, S. and Hammecker, C. *}, journal = {Geoderma}, year = {2004}, volume = {119}, pages = {233--247}, }