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Effects of Organic Amendments on the Reduction and Phytoavailability of Chromate in Mineral Soil

^a Soil & Earth Science Group, Massey Univ., Palmerston North, New Zealand
^b Savannah River Ecology Laboratory, Drawer E, Aiken, SC 29802

View larger version (26K): [in a new window]   Fig. 1. Amounts of Cr(VI) reduced during the incubation of Cr(VI) with the unamended and amended soils (•, soil; , soil + horse manure; , soil + farm yard manure; , soil + fish manure; , soil + spent mushroom; , soil + pig manure; , soil + poultry manure; , soil + biosolid compost). Fitted curves are shown as solid lines.

View larger version (16K): [in a new window]   Fig. 2. Relationship between Cr(VI) reduction and (a) easily oxidizable organic carbon and (b) dissolved organic carbon in the unamended and amended soils.

View larger version (19K): [in a new window]   Fig. 3. Relationships between (a) Cr(VI) reduction and pH of the unamended and amended soils and (b) theoretical and measured amounts of protons consumed during Cr(VI) reduction.

View larger version (20K): [in a new window]   Fig. 4. (a) Dry matter yield of mustard plants and (b) the concentration of total Cr in plant tissue at various levels (g organic carbon kg-1 soil) of biosolid compost addition (•, 0; , 25; , 50; , 100).

View larger version (19K): [in a new window]   Fig. 5. Relationships between dry matter yield and (a) soil solution Cr(VI) concentration and (b) plant tissue total Cr concentration.