Table 2 Physicochemical and microbial properties of soil samples

Physicochemical properties

Soil porosity (%)

85

52

THC (mg kg^− 1)

137

19,850

TN (%)

0.85

0.27

pH

5.86

6.74

Phosphorous (mg kg⁻¹)

18.2

6.4

TOC (%)

3.28

8.52

Nitrate (mg kg⁻¹)

0.85

0.27

Phosphate (mg kg⁻¹)

55.9

84.3

Sodium (mg kg⁻¹)

10.3

4.2

Potassium (mg kg⁻¹)

163.7

42.8

Calcium (mg kg⁻¹)

1306

154

Sulphate (mg kg⁻¹)

5.9

13.9

Sodium adsorption ratio

2.1

11.5

Moisture content (%)

8.46

6.24

Oil and grease (mg L⁻¹)

306

14,721

CEC (meq 100 g⁻¹)

14

74

Electrical conductivity (μS cm⁻¹)

30

79

Microbial properties

TBC (CFU mL⁻¹)

3.5 × 10⁶

1.3 × 10²

HUB (CFU mL^− 1)

2.2 × 10²

1.6 × 10²

HUF (SFU mL^− 1)

1.1 × 10²

1.0 × 10²