Chemical and Biological Technologies in Agriculture

Table 1 Element compositions and BET of halophyte biochar (HBC), H₃PO₄-modified biochar (P-HBC), and H₄P₂O₇-modified biochar (PA-HBC)

From: Effects of acidic phosphorus-rich biochar from halophyte species on P availability and fractions in alkaline soils

Property	Treatment
Property	HBC	P-HBC	PA-HBC
C (%)	59.79	45.62	32.45
N (%)	1.07	0.56	0.84
H (%)	2.96	3.13	1.85
O (%)	11.81	23.64	39.74
Atomic ratio O/C	0.15	0.39	0.92
Atomic ratio H/C	0.59	0.82	0.68
Ash (%)	24.37	27.06	26.12
BET surface area (m²·g^− 1)	11.89	1.00	0.71
Average pore diameter (nm)	7.17	3.78	2.43
Total pore volume (cm³·g^− 1)	0.0291	0.0010	0.0007

O% = 100%–(C% + N% + H% + Ash%)

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