Standardized scores for resistance to penetration (RP), soil bulk density (BD), macroporosity (Ma), potential acidity (H + Al), total porosity (TP), weighted mean diameter (WMD), exchangeable sodium percentage (ESP), electrical conductivity in the saturation extract (EC), cation exchange capacity (CEC), organic matter (OM), microbial biomass carbon (MBC), metabolic quotient (
qCO2) and microbial quotient (qMic) obtained in the treatments (A) not irrigated (NI), (B) irrigated with treated domestic sewage with supplementary fertigation (ISF), (C) irrigated with treated domestic sewage without fertigation (IS), (D) irrigated with surface reservoir water and fertigated (IWF) and (E) irrigated with surface reservoir water without fertigation (IW)
For example, it has been shown that soils receiving applications of biosolids containing elevated concentrations of a range of heavy metals often show an increase in
qCO2 with a concomitant decrease in biomass, in response to the toxic impact of metals on soil microorganisms (Chandler and Brookes 1991; Fliessbach et al.