Organic Amendments and Earthworm Addition Improve Properties of Nonacidic Mine Tailings

Table 6

Mean earthworm numbers (± standard deviation) in each of the experimental units at the end of the study (𝑛=3).

Treatment	Earthworm numbers
T1-W	7.0±3.6 ab
T2-W	19.7±17.6 a
T3-W	12.7±0.6 ab
T5-W	2.0±2.8 b
T6-W	20.3±10.4 a
T7-W	11.7±3.2 ab

Treatments T4-W and T8-W were discontinued at week 7 when earthworms died immediately after addition.