Table 2: Metal uptake rates (means where ) by corn grown on sand media amended, without biosolids (Standard) and with biosolids at different growth stages.

MetalPlant tissueTreatmentTime (weeks)
0–22–44–88–1212–16
g g−1 2 wk−1

CdShootStandard0.5a0.2bn.d.n.d.n.d.
Biosolids7.0a7.0a5.0a5.0a6.0a
RootStandard1.9a1.8an.d.n.d.n.d.
Biosolids36b37b25b38b79a

CrShootStandard1.3a1.0a0.4b0.4b0.4b
Biosolids1.9a1.6b0.5c0.5cn.d.
RootStandard3.6a1.7b0.7c0.7c0.7c
Biosolids16a10b3.0c3.0cn.d.

CuShootStandard13a10a3.0b3.0b3.0b
Biosolids19a15b7.0c5.0c6.0c
RootStandard23a20a10b8.0bn.d.
Biosolids71a54b22c16c12c

NiShootStandard16a12a5.0b4.0b4.0b
Biosolids52a35b10c11cn.d.
RootStandard20a19a6.0b5.0bn.d.
Biosolids321a215b81c59d16e

PbShootStandard6.0a5.0a2.0b1.0b2.0b
Biosolids15a12b5.0c4.0c5.0c
RootStandard6.0a5.0a1.0b1.0bn.d.
Biosolids37a14b6.0c4.0c5.0c

ZnShootStandard30b30b21b19b63a
Biosolids157b165b127b185b687a
RootStandard58a60a57a73an.d.
Biosolids235a179b81c76c31c

The differences of metal rates among the time periods were tested by one-way ANOVA. Within a row and between shoot and root, values followed by same letters were not significantly different at .
Metal uptake rate was not detected in this period.