Microbial respiratory activity followed a similar trend, with M
exceeding O and V, among crop systems, and with N overcoming C,
when comparing tillage systems. This variable was correlated with
microbial biomass (r ¼ 0.839; p ¼ 0.037), suppression (r ¼ 0.871;
p ¼ 0.024) and soil organic matter (r ¼ 0.930; p ¼ 0.007).