Availability and Plant Uptake of Biosolid-Borne Metals

Table 1

Metal concentrations (means ± SD where 𝑛=4) of corn tissues grown on sand media amended, without biosolids (Standard) and with biosolids^†.

Plant tissue	Treatment	Time (weeks)
		0–4	4–16
		mg kg^−1
		Cd
Shoot	Standard	0.38 (0.04)^a	0.03 (0.004)^b
	Biosolids	7.25 (1.27)^b	9.50 (1.09)^a
Root	Standard	1.85 (0.31)^a	0.20 (0.02)^b
	Biosolids	36.5 (4.06)^b	60.7 (2.82)^a
		Cr
Shoot	Standard	1.20 (0.11)^a	0.83 (0.03)^b
	Biosolids	2.70 (0.49)^a	1.43 (0.06)^b
Root	Standard	1.80 (0.14)^a	1.17 (0.07)^b
	Biosolids	13.5 (0.84)^a	6.00 (1.42)^b
		Cu
Shoot	Standard	12.0 (0.55)^a	6.67 (0.13)^b
	Biosolids	17.0 (0.55)^a	12.7 (0.80)^b
Root	Standard	22.0 (1.45)^a	18.3 (1.20)^b
	Biosolids	63.5 (6.70)^a	40.3 (3.97)^b
		Ni
Shoot	Standard	14.5 (0.90)^a	9.00 (0.57)^b
	Biosolids	44.0 (4.65)^a	23.3 (2.01)^b
Root	Standard	19.5 (2.15)^a	12.7 (0.60)^b
	Biosolids	276 (49.5)^a	149 (41.7)^b
		Pb
Shoot	Standard	5.50 (0.65)^a	3.33 (0.27)^b
	Biosolids	13.5 (1.01)^a	9.33 (0.71)^b
Root	Standard	5.50 (0.65)^a	2.33 (0.37)^b
	Biosolids	27.1 (1.95)^a	11.1 (0.27)^b
		Zn
Shoot	Standard	30.0 (1.15)^b	39.3 (0.73)^a
	Biosolids	161 (9.50)^b	295 (9.67)^a
Root	Standard	58.5 (2.00)^b	120 (5.00)^a
	Biosolids	211 (15.5)^a	158 (3.67)^b

†The differences of metal concentrations among the growth periods were tested by one-way ANOVA and Student-Newman-Keuls test. Within a row and between shoot and root, values followed by different letters were significantly different at 𝑃<0.05.