@ARTICLE {VAN ASTEN:2004, title = {Using farmer knowledge to combat low productive spots in an irrigated rice scheme in Burkina Faso}, author = {Van Asten, P. and Barro, S. and Wopereis, M. and Defoer, T. }, journal = {Land Degradation and Development}, year = {2004}, volume = {15}, pages = {383--396}, }