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Fig. 1. Amounts of Cr(VI) reduced during the incubation of Cr(VI) with the unamended and amended soils (•, soil; {blacktriangleup}, soil + horse manure; {diamondsuit}, soil + farm yard manure; {Delta}, soil + fish manure; {circ}, soil + spent mushroom; {square}, soil + pig manure; {blacksquare}, soil + poultry manure; {diamond}, soil + biosolid compost). Fitted curves are shown as solid lines.