Research Article
Influence of Stabilized Biosolids Application on Availability of Phosphorus, Copper, and Zinc
Table 2
Selected characteristics and metal concentrations in the studied soils and sewage sludge.
| | | Soil classification | | | | Tested characteristics | Calcareous soil | Fluvial soil | Sewage sludge (SS1) | Sewage sludge (SS2) | | Typic Torrifluvents | Typic Calcorthids |
| | Tested basic characteristics | | | | | | pH | 7.82 | 7.71 | 6.28 | 5.86 | | EC, dSm−1 | 0.94 | 0.55 | 3.90 | 3.80 | | OM, g kg−1 | 14.90 | 22.20 | 144.50 | 149.20 | | CEC, cmol(+)/kg | 12.63 | 34.10 | 35.80 | 36.30 | | CaCO3,
% | 28.50 | 5.30 | 15.20 | 9.88 | | Olsen-P, mg kg−1 | 8.70 | 7.70 | 53.90 | 57.30 |
| | Particle size distribution, % | | | | | | Sand | 53.58 | 18.52 | — | — | | Silt | 28.72 | 56.30 | — | — | | Clay | 17.70 | 25.18 | — | — | | Texture class | Sandy clay loam | Silty loam | — | — |
| | DTPA-extracted elements, mg kg−1 | | | | | | Zn | 2.18 | 1.21 | — | — | | Cu | 3.10 | 4.26 | — | — | | Pb | 1.25 | 2.18 | — | — | | Ni | 0.24 | 0.45 | — | — | | Cd | 0.02 | 0.02 | — | — |
| | Aqua-regia-extracted elements, mg kg−1 | | | | | | Fe | 18250.50 | 55724.00 | 30260.00 | 39907.50 | | Mn | 331.50 | 779.00 | 723.00 | 251.00 | | Zn | 57.20 | 111.80 | 1437.20 | 1218.10 | | Cu | 24.50 | 56.10 | 158.80 | 148.90 | | Cd | 1.50 | 1.15 | 1.45 | 1.40 | | Ni | 23.10 | 60.00 | 34.10 | 41.90 | | Pb | 46.50 | 63.50 | 193.00 | 120.50 |
|
|
EC: electric conductivity (dSm−1); OM: organic matter; CEC: cation exchange capacity (cmol(+)/kg); (—): not measured; DTPA: diethylenetriaminepenta-acetic acid.
|
