Table 2: The state of D. veneta vermipopulations in oil-contaminated soil (Experiment 2) after 22 weeks of incubation

Sample No. Survival % Total population pcs. Total productivity cocoons/container Individual productivity cocoons/species
1. Control 100 33 ± 0.98 3.4 ± 0.05 1.5 ± 0.01
2. Microbiological preparation 100 95 ± 2.05 15.4 ± 0.12 2.1 ± 0.01
3. Soil with petroleum concentration 20 g/kg 100 112 ± 2.33 27.2 ± 0.56 2.96 ± 0.02
4. Soil with petroleum concentration 20 g/kg and biopreparation 100 88 ± 1.98 20.3 ± 0.51 2.45 ± 0.02
5. Soil with petroleum concentration 40 g/kg 100 126 ± 2.5 23.8 ± 0.55 2.76 ± 0.02
6. Soil with petroleum concentration 40 g/kg and biopreparation 0 0 0 0
7. Soil with petroleum concentration 60 g/kg 100 146 ± 2.75 36.3 ± 0.89 3.14 ± 0.03
8. Soil with petroleum concentration 60 g/kg and biopreparation 0 0 0 0