Table 2. pH values, electrical conductivity (EC), ash content, cation exchange capacity (CEC), BET surface area, pore volume and pore size of W-BC, C-BC and P-BC at different pyrolytic temperatures.

Biochars	Temp. (°C)	pH	EC (µs cm−1)	Ash content (%)	CEC (cmol kg−1)	Surface area (m2 g−1)	Pore volume (cm3 g−1)	Pore size (nm)
W-BC	400	8.2g	100j	11ed	4.0ef	10b	0.012ab	4.6bc
	500	8.3g	108i	11ed	5.1e	111ef	0.090c	3.3b
	600	9.2f	141k	12cd	1.3g	177f	0.110c	2.5a
	700	9.2f	172k	15b	0.5g	107e	0.058b	2.2a
C-BC	400	10.2b	350d	14bc	38.3b	4a	0.008a	8.1d
	500	10.4a	864c	17a	68.6a	6a	0.012ab	2.1a
	600	10.4a	1936b	18a	20.1c	7ab	0.012ab	6.3cd
	700	10.4a	2221a	18a	19.0c	3a	0.006a	8.2d
P-BC	400	9.3e	204g	9e	7.2fg	5a	0.007a	5.2c
	500	9.4e	221h	10ed	8.5d	28c	0.022ab	3.2b
	600	9.6d	242f	11ed	1.2g	185f	0.110c	2.4a
	700	9.9c	261e	12cd	0.3g	49d	0.033b	2.7ab

Note: Different letters indicate significant difference for the results in the same column.