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Fig. 5. Tillage effects on the distribution of sand-free intra-aggregate light fraction organic matter in 2002, 2003, and 2004. Initial cultivation was in June 2002. 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. Size classes within a sampling date and treatment with different letters are significantly different.
