Figure 3

Earthworm density according to the duration of the experiments. The EW density distribution is as follows: Min: 0.15 mg EW/g dry, 1st quartile: EW density = 1.028 mg EW/g dry soil, 2nd quartile: EW density = 1.95 mg EW/g dry soil, 3rd quartile: EW density = 5.45 mg EW/g dry soil, max = 290 mg EW/g dry.