Microcosm code Biostimulation treatment %degradation BE (%)
C PD 96.62 ± 0.44 30.5
M PD+CP 96.18 ± 0.33 30.2
R GS+MS 95.59 ± 0.24 29.8
H CD+GS 95.42 ± 0.32 29.7
P GS+BS 95.29 ± 0.24 29.6
I CD+MS 95.19 ± 0.22 29.5
N GS+CP 95.03 ± 0.15 29.4
D CP 94.86 ± 0.51 29.2
J CD+CP 94.71 ± 0.62 29.1
P PD+CD 94.44 ± 0.25 28.9
K PD+BS 94.26 ± 0.39 28.8
S BS+MS 93.82 ± 0.23 28.5
B CD 93.79 ± 0.50 28.4
L PD+GS 93.59 ± 0.45 28.3
G GS 93.52 ± 0.27 28.2
E MS 93.08 ± 0.38 27.9
F BS 92.73 ± 0.25 27.6
Q BS+CP 92.13 ± 0.33 27.1
T NPK fertilizer 90.75 ± 0.10 26.0
A Unamended soil (natural attenuation) 67.12 ± 1.08 -
Table 5: Percentage degradation of crude oil and biostimulant efficiency at the
end of six weeks.