Biochemical activities in a degraded soil restored by two amendments: a laboratory study
2002
Saviozzi, A. | Bufalino, P. | Levi-Minzi, R. | Riffaldi, R.
This study investigated the soil biochemical activity after different amounts of organic materials with varying degrees of stability [sewage sludge (SS), and farmyard manure (FYM)] were incorporated into a degraded Mediterranean soil. SS greatly enhanced the biomass C content and increased respiration. Soil treated with fresh material (SS) produced more CO2 than that treated with stabilized FYM, with higher values being obtained at the highest dose. FYM maintained high levels of dehydrogenase (DH-ase) activity, indicating a biochemical regeneration of the soil. C mineralization was less affected by FYM and SS than expected using an additive calculation, while additivity was observed for DH-ase activity only in SS-treated soil. Protease activity showed additivity in FYM-amended soil, while greater than additivity was found for the addition of SS.
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