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Fig. 3. Phosphorus concentrations in (A) mineral horizon, (B) humus, and (C) litter, from March 2002 to March 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.
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