Application of Biochar in the Remediation of Contaminated Soil with High Concentration of Lead and Zinc

Table 4

The fertility properties of the biochar and PC-treated soils.

	Standard limit	Untreated soil	Biochar-treated soil			PC-treated soil
			5%	8%	10%	5%	8%	10%
N (mg/kg)	≥40	52	68	84	102	41	43	38
P (mg/kg)	≥8	12.8	19.2	20.1	28.7	8.7	5.1	3.7
K (mg/kg)	≥60	79	139	154	155	51	47	50
Organic content (g/kg)	≥12	15.6	17.4	16.9	18.3	10.2	9.7	9.1
CEC (cmol (+)/kg)	≥10	5.6	12.1	17.8	19.4	5.7	6.1	3.2