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Compost and Calcium Surface Treatment Effects on Subsoil Chemistry in Acidic Minespoil Columns

Department of Crop and Soil Sciences, Penn State Univ., 116 ASI Building, University Park, PA 16802

View larger version (23K): [in a new window]   Fig. 1. Cumulative dissolved organic carbon (DOC) leaching, calculated from the leachates collected at the bottom of the columns. Values are means of three replicates ± standard deviation. N, no Ca added; G, gypsum; L, CaCO3; LG, CaCO3 + gypsum; c0, no compost added (values for N, G, L, LG all fell on this line); cm, 34.4 g kg-1 compost; ch, 68.8 g kg-1 compost.

View larger version (34K): [in a new window]   Fig. 2. Cumulative leaching of Ca (left panel) and Al (right panel) calculated from the leachates collected at the bottom of the columns. Values are means of three replicates ± standard deviation. N, no Ca added; G, gypsum; L, CaCO3; LG, CaCO3 + gypsum; c0, no compost; cm, 34.4 g kg-1 compost; ch, 68.8 g kg-1 compost.

View larger version (16K): [in a new window]   Fig. 3. Solubility diagram for jurbanite [AlSO4(OH)·5H2O], alunite [KAl3(SO4)2(OH)6], basaluminite [Al4(OH)10SO4·17H2O], and diaspore (AlOOH). The Al3+ activities were calculated from the measured Al concentration, accounting for the formation of Al–SO4 complexes. Thermodynamic data are taken from Lindsay and Walthall (1996). Lines are calculated by assuming log = -1.83. Error bars are for log = -0.83 and log = -2.83. For alunite we assumed log(K+) = -5.6. Black dots represent measured data.