Fig. 4

Vertical distribution of gravimetric soil water content in the 0–60 cm depth in Contour ridge tillage plots (CRT) and plots without CRT (Ctrl) in Sorobougou village in Cinzana commune in 2012 and 2013; a beginning of the growing season (July 22, 2012; July 20, 2013); b middle of the growing season (August 7, 2012; August 5, 2013); c end of the growing season (September 7, 2012; September 4, 2013); dry soil soil during the dry season (May 5, 2012); bars indicate standard errors of the means