Fig. 3. Calorespirometric ratios of Milli-Q water (RatioMilli-Q) and glucose (RatioGlucose) amended soils. Mean values of four technical replicates and the error bars indicate standard errors. Ratios are significantly different between Milli-Q water and glucose amendments at P < 0.05, 0.01 or 0.001(Student's t-test) when soil treatments are suffixed by *, ** or ***, respectively. Soil treatment suffixed with ‘ assumes unequal variances when applying Student's t-test.