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In Situ Soil Treatments to Reduce the Phyto- and Bioavailability of Lead, Zinc, and Cadmium

^a College of Forest Resources, University of Washington, Seattle, WA 98195
^b USDA-ARS, Animal Manure and By-Products Laboratory, Beltsville, MD 20705
^c USDA-ARS HNRS, Diet and Human Performance Laboratory, Beltsville, MD 20705
^d DuPont Central Research and Development, Newark, DE 19702

View larger version (40K): [in a new window]   Fig. 1. In vitro extractable Pb for field-collected samples. Data shown are means ± standard errors for samples collected in 1997 and 1998 (0.5 and 1.5 yr after amendment addition).

View larger version (18K): [in a new window]   Fig. 2. The relationship between in vitro extractable Pb from lab-incubated and field-amended samples. Data shown were all extracted at pH 2.2.

View larger version (28K): [in a new window]   Fig. 3. The natural log (ln) of the ratio of plant Pb to soil Pb for tall fescue grown at the field site in Joplin, MO. Results are averaged across all harvests. Different letters above bars indicate significantly different values using the Duncan–Waller means separation procedure (p < 0.05).

View larger version (50K): [in a new window]   Fig. 4. The ratio of plant Zn and Cd to soil Zn and Cd for tall fescue grown on amended field plots in Joplin, MO. Results are averaged across five harvests. Different letters above bars indicate significantly different values using the Duncan–Waller means separation procedure (p < 0.05).