Fly Ash and Composted Biosolids as a Source of Fe for Hybrid Poplar: A Greenhouse Study
Table 6
Soil Cr, Pb, Ba, and Cd levels in a Doak sandy loam amended with industrial byproducts.
Cr
Pb
Ba
Cd
(mg kg−1)
(mg kg−1)
(mg kg−1)
(mg kg−1)
Literature
U.S. EPA 40 CFR 503 Rule
—
300.0
—
39.00
European Union limit values
—
750–1,200
—
20–40
EU proposed
1000.0
750.0
—
10.00
Treatments
Control
7.28 a
5.19 a
97.23 e
0.16 a
Fe EDDHA + UAN
7.60 a
5.19 a
98.18 de
0.17 a
ACB DTPA
8.34 a
5.07 a
105.83 cd
0.16 a
ACB 22.75
7.80 a
5.05 a
102.33 de
0.15 a
ACB 44.5
7.92 a
5.12 a
100.84 de
0.17 a
FA 22.75 + UAN
7.68 a
5.22 a
111.48 bc
0.17 a
FA 44.50 + UAN
7.51 a
4.93 a
119.25 b
0.17 a
FA DTPA + UAN
7.53 a
4.86 a
137.63 a
0.17 a
Mean
7.71
5.08
109.10
0.16
LSD
NS
NS
8.46
NS
Value
0.34
1.02
20.93
0.95
Pr
0.9302
0.4274
<.0001
0.48
Pollutant concentration limits and loading rates for land application in the United States. European Union limit values for concentrations of heavy metals in biosolids for use on land [42]. Refer to Experimental Design and Statistical Analysis section for treatment codes.
