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Fig. 4. Potassium and Mg concentrations in (A) mineral horizon and (B) humus, in March 2002, 2003, and 2004, for D0 (control), D50 (50 Mg ha–1 of compost), and D100 (100 Mg ha–1 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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