. 2014 Dec 12;22(4):503–511. doi: 10.1016/j.sjbs.2014.12.003

Table 2.

Treatment effects on NH₄OAc- and AB-DTPA-extractable heavy metals.

Moisture levels	Biochar rates (%)	Fe	Mn	Zn	Cu	Cd	Pb
		NH₄OAc-extractable heavy metals (mg kg⁻¹)
75% FC	0.0	ND	1.41	24.9	48.3	0.62	7.36
	1.0	ND	0.84	18.9	36.7	0.47	5.77
	3.0	ND	0.80	19.4	37.7	0.45	5.11
	5.0	ND	0.79	17.6	35.2	0.40	4.75
LSD₁		–	0.24	4.12	4.86	0.16	1.02
100% FC	0.0	ND	1.59	28.2	62.7	0.68	7.81
	1.0	ND	0.91	20.8	45.2	0.50	5.99
	3.0	ND	0.99	19.3	44.0	0.57	5.92
	5.0	ND	0.82	20.8	37.0	0.52	5.56
LSD₁		–	0.25	5.96	10.7	0.12	0.87
LSD₂		–	NS	NS	7.45	NS	NS

		AB-DTPA-extractable Heavy metals (mg kg⁻¹)
75% FC	0.0	4.91	4.68	364	521	3.09	234
	1.0	3.50	3.23	307	415	2.61	207
	3.0	2.44	2.08	234	293	2.01	149
	5.0	3.67	3.50	242	354	1.85	163
LSD₁		0.44	0.41	58.5	51.4	0.41	34.3
100% FC	0.0	4.75	5.36	356	501	3.14	220
	1.0	3.93	3.73	343	403	2.78	198
	3.0	3.97	3.82	324	387	2.63	194
	5.0	3.74	3.47	327	369	2.46	195
LSD₁		0.57	0.61	23.4	54.5	0.12	16.0
LSD₂		NS	NS	37.9	NS	NS	NS

LSD₁: least significance difference at p = 0.05 for biochar effect; LSD₂: least significance difference at p = 0.05 for moisture effect; NS: not significant; ND: not detectable.