at present, many risk assessments and regulations for the application of sewage sludge in many countries are based on total and available metal concentrations in soil
in this study, considerable effort has been devoted to to estimating the fate of enzymatic activity in the sludge-amended soils.
a good N balance is critical factor in any land application program.
high amounts of N in the initial sludge application or N fertilization in the sludge-amended soil can result in enzyme inhibition