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Fig. 3. Mean root diameter (MD) at anthesis of maize as a function of soil depth and tillage system [no-tillage (NT) and conventional tillage (CT)] in Zollikofen and Schafisheim in 1997 and 1999. *, **, and *** indicate significance at P < 0.05, 0.01, and 0.001 probability levels, respectively; blank is not significant.