Metabolic quotient (qCO₂) in conservative and conventional management systems in 2014 and 2015. CWC: chemical weed control, MWC: permanent grass cover, LL: Land levelling, US: Undisturbed soil, CON: conventional farming, ORG: organic farming, B_C: microbial biomass C. Bars represent standard deviation (n = 3). For each pair of treatments, *, ** and *** indicates significant differences at 0.05, 0.01 and 0.005 significance level, respectively (T test).