Soil type

Day 1

Day 2

Day 5

Day 7

Day 14

GS (100%)*

2 (33.33)

3 (60)

3 (60)

4 (100)

4 (100)

GS (50%)*

0(0)

2 (28.57)

3 (42.86)

3 (42.86)

4 (57.14)

GS (10%)

0(0)

0(0)

1(14.29)

2 (28.57)

3 (42.86)

NCS

0(0)

0(0)

0(0)

0 (0)

0(0)

CS

0(0)

0(0)

0(0)

0 (0)

0 (0)

*=significantly different at P<0.05 The t-test results comparing means of swollen clitellum in surviving earthworms exposed to gasoline contaminated soil showed that there was significant (P<0.05) difference in GS with 100% and 50% mixture compared to the control media (NCS) where as there was no significant difference in GS with 10% mixture and CS (P>0.05) compared to the control media.
Table 3: Mean number of swollen clitella earthworms (Percentage in Parenthesis) exposed to gasoline contaminated soil.