Fig. 7. Soil bulk density corresponding to each considered treatment (N = 10). The
thick-red line within each box represents the geometric mean value (the dashed
blue line, the median). Means labeled by the same letter are not significantly
different, according to a two-tailed t-test (P = 0.05). (For interpretation of the
references to color in this
figure legend, the reader is referred to the web version of
this article.)