Table 1: Metal concentrations (means ± SD where ) of corn tissues grown on sand media amended, without biosolids (Standard) and with biosolids.

Plant tissueTreatmentTime (weeks)
0–44–16
mg kg−1

Cd
ShootStandard0.38 (0.04)a0.03 (0.004)b
Biosolids7.25 (1.27)b9.50 (1.09)a
RootStandard1.85 (0.31)a0.20 (0.02)b
Biosolids36.5 (4.06)b60.7 (2.82)a

Cr
ShootStandard1.20 (0.11)a0.83 (0.03)b
Biosolids2.70 (0.49)a1.43 (0.06)b
RootStandard1.80 (0.14)a1.17 (0.07)b
Biosolids13.5 (0.84)a6.00 (1.42)b

Cu
ShootStandard12.0 (0.55)a6.67 (0.13)b
Biosolids17.0 (0.55)a12.7 (0.80)b
RootStandard22.0 (1.45)a18.3 (1.20)b
Biosolids63.5 (6.70)a40.3 (3.97)b

Ni
ShootStandard14.5 (0.90)a9.00 (0.57)b
Biosolids44.0 (4.65)a23.3 (2.01)b
RootStandard19.5 (2.15)a12.7 (0.60)b
Biosolids276 (49.5)a149 (41.7)b

Pb
ShootStandard5.50 (0.65)a3.33 (0.27)b
Biosolids13.5 (1.01)a9.33 (0.71)b
RootStandard5.50 (0.65)a2.33 (0.37)b
Biosolids27.1 (1.95)a11.1 (0.27)b

Zn
ShootStandard30.0 (1.15)b39.3 (0.73)a
Biosolids161 (9.50)b295 (9.67)a
RootStandard58.5 (2.00)b120 (5.00)a
Biosolids211 (15.5)a158 (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 .