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Short-term Effects of Sewage-Sludge Compost on a Degraded Mediterranean Soil

Institut Méditerranéen d'Ecologie et de Paléoécologie, UMR CNRS 6116, Université de Provence; Case 421, FST St Jérôme; 13397 Marseille Cedex 20– France

View larger version (20K): [in a new window]   Fig. 1. Mean air temperature and rainfall from January 2002 to March 2004 (Météo France).

View larger version (37K): [in a new window]   Fig. 2. (A) Organic matter (OM), total N, C/N ratio, cation exchange capacity of humus, and (B) OM, total N, C/N ratio, pHH2O of litter, from March 2002 to March 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.

View larger version (33K): [in a new window]   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 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.

View larger version (22K): [in a new window]   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).

View larger version (31K): [in a new window]   Fig. 5. Trace metal concentrations in 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).

View larger version (29K): [in a new window]   Fig. 6. Trace metal concentrations in litter, 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).