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Fig. 5. Trace metal concentrations in humus, in March 2002, 2003, and 2004, for D0 (control), D50 (50 Mg ha1 of compost), and D100 (100 Mg ha1 of compost) plots. Mean ± Standard Error, N = 4. ANOVA: *p < 0.05; **p < 0.01; ***p < 0.001. Results of the comparison are given by a letter: values that do not differ at the 0.05 level are noted with the same letter (a < b < c).
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