Abstract
Abstract The effects of top coverings of organic matter and subsoil on the growth potential of chromate smelter waste were investigated in glasshouse experimental trials. Peat and sewage sludge were superior to soil but regression occurred due to root restriction and desiccation unless the waste was initially covered with a 25–30 cm layer of granular, free-draining subsoil. This material provided a waste-free rooting medium and restricted chromate mobility, thereby preventing contamination of the rooting medium, even under conditions of severe water stress. It was concluded that unavoidable contamination of the subsoil cover during large-scale reclamation should be treated by ferrous sulphate application and organic matter amelioration.
Published Version
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