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| Immobilization of hexachlorocyclohexane and growth of ryegrass by organic clays in soils |
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Abstract Effects of the application of organic clays as soil amendments on hexachlorocyclohexane (HCH) immobilization and on ryegrass growth in contaminated soils were investigated. The organic clays have proved to be effective environmental and agronomic amendments for reducing the mobility and biological effectiveness of HCH. The results from pot experiments in greenhouse indicated that the organic clays could significantly fix the HCH in soils and reduce its concentrations in ryegrass. Compared with the control, concentrations of HCH in roots and shoots of ryegrass were reduced by 53.9%~87.6% and 37.4%~56.6% through addition of 8% organic clays, the shoot biomass increased by 52.3%~119.3% through the addition of 1%~4% organic clays.
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Received: 14 September 2009
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