For the C/N of straw, the differences in the distributions remained similar when comparing the soil depths to which the material was added for the two incubation times and median C/N signatures were higher by 7 and 13 C/N units in subsoil (Table 2 and 3). The C/N was greatly modified by incubation (Table 3) with similar magnitudes at both depths corresponding to decreases by about 40 units, as highlighted by the high Kolmogorov-Smirnov D statistic (Figure 2).