Table 5.

Bioconcentration factor (BCF) for Zn, Fe, Cd, and Ni in Zea mays L. under different treatments.

Metal	Amendment content
		1%	3%	5%
Zn	Sewage sludge	0.665	1.045	1.154
	Biochar	0.321	0.411	0.491
Fe	Sewage sludge	0.161	0.134	0.132
	Biochar	0.114	0.108	0.096
Cd	Sewage sludge	1.624	2.482	1.718
	Biochar	0.909	1.176	0.777
Ni	Sewage sludge	0.362	0.398	0.372
	Biochar	0.316	0.286	0.328