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Fig. 1. Mean weight diameter (MWD) of soil aggregates at 0- to 7- and 7- to 20-cm soil depth. The June 2002 sampling was performed before cultivation. The May 2003 samples were taken before the second cultivation. Treatment means are shown ± standard error (n = 4). * Indicates statistically significant (P < 0.05) differences between control and tilled treatments within a single sampling date; 
indicates significant differences between depths within a treatment and sampling date.
