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Microcosm experiment setup.
| Condition | Soil | Amendment/Treatment detail |
|---|---|---|
| Natural attenuation (NA) | Soil A | None - Control |
| Soil B | ||
| Biostimulated (BioS) | Soil A | Amended with NH4NO3 + KH2PO4 |
| Soil B | ||
| Biostimulated and bioaugmented (BioS + BioA) | Soil A | Same as BioS and inoculated with hydrocarbon degrader (5 × 107 cells per g soil dry weight) |
| Soil B | ||
| Ground and Biostimulated (G + BioS) | Soil A | Same as BioS plus soil grinding |
