Table 3 Biochemical properties of biochar and soil

pH

9.50

7.76

Total nitrogen (g·kg⁻¹)

0.89

0.46

Total P (g·kg⁻¹)

2.54

0.82

Organic matter (g·kg⁻¹)

625

14.73

Total K (g·kg⁻¹)

8.62

246.83

Total Cd (mg·kg⁻¹)

0.002

0.25

Available Cd

-

0.121

Total salinity (g·kg⁻¹)

-

3.36

Carboxyl (mmol·g⁻¹)

0.20

-

Lactone (mmol·g⁻¹)

0.25

-

Phenolic hydroxyl (mmol·g⁻¹)

0.21

-