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.

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