Table 1. Main properties of biochar derived from rice husk and melaleuca used in the field experiment.

Items	Rice husk	Melaleuca
pH (H 2O)	9.56	7.54
EC (mS cm −1)	0.78	0.28
CEC (cmol (+) kg −1)	13.2	9.55
Total C (g kg −1)	253.5	291.8
Total N (g kg −1)	3.26	2.50
Total P (g kg −1)	0.13	0.33
Specific surface area (m 2 g −1)	51.93	2.04
Total pore volume (cm 3 g −1)	0.026	0.001