Availability and Plant Uptake of Biosolid-Borne Metals
Table 2
Metal uptake rates (means where ) by corn grown on sand media amended, without biosolids (Standard) and with biosolids at different growth stages†.
Metal
Plant tissue
Treatment
Time (weeks)
0–2
2–4
4–8
8–12
12–16
g g−1 2 wk−1
Cd
Shoot
Standard
0.5a
0.2b
n.d.‡
n.d.‡
n.d.‡
Biosolids
7.0a
7.0a
5.0a
5.0a
6.0a
Root
Standard
1.9a
1.8a
n.d.‡
n.d.‡
n.d.‡
Biosolids
36b
37b
25b
38b
79a
Cr
Shoot
Standard
1.3a
1.0a
0.4b
0.4b
0.4b
Biosolids
1.9a
1.6b
0.5c
0.5c
n.d.‡
Root
Standard
3.6a
1.7b
0.7c
0.7c
0.7c
Biosolids
16a
10b
3.0c
3.0c
n.d.‡
Cu
Shoot
Standard
13a
10a
3.0b
3.0b
3.0b
Biosolids
19a
15b
7.0c
5.0c
6.0c
Root
Standard
23a
20a
10b
8.0b
n.d.‡
Biosolids
71a
54b
22c
16c
12c
Ni
Shoot
Standard
16a
12a
5.0b
4.0b
4.0b
Biosolids
52a
35b
10c
11c
n.d.‡
Root
Standard
20a
19a
6.0b
5.0b
n.d.‡
Biosolids
321a
215b
81c
59d
16e
Pb
Shoot
Standard
6.0a
5.0a
2.0b
1.0b
2.0b
Biosolids
15a
12b
5.0c
4.0c
5.0c
Root
Standard
6.0a
5.0a
1.0b
1.0b
n.d.‡
Biosolids
37a
14b
6.0c
4.0c
5.0c
Zn
Shoot
Standard
30b
30b
21b
19b
63a
Biosolids
157b
165b
127b
185b
687a
Root
Standard
58a
60a
57a
73a
n.d.‡
Biosolids
235a
179b
81c
76c
31c
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.