Removal of metals by sorghum plants from contaminated land |
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Authors: | ZHUANG Ping SHU Wensheng LI Zhian LIAO Bin LI Jintian and SHAO Jingsong |
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Institution: | 1. Institute of Ecology, South China Botanic Garden, Chinese Academy of Sciences, Guangzhou 510560, China;School of Life Sciences, and State Key Laboratory of Biocontrol, Sun Yat-sen University, Guangzhou 510275, China 2. School of Life Sciences, and State Key Laboratory of Biocontrol, Sun Yat-sen University, Guangzhou 510275, China 3. Institute of Ecology, South China Botanic Garden, Chinese Academy of Sciences, Guangzhou 510560, China |
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Abstract: | The growth of high biomass crops facilitated by optimal of agronomic practices has been considered as an alternative to phytoremediation of soils contaminated by heavy metals. A field trial was carried out to evaluate the phytoextraction efficiency of heavy metals by three varieties of sweet sorghum (Sorghum biocolor L.), a high biomass energy plant. Ethylene diamine tetraacetate (EDTA), ammonium nitrate (NH4NO3) and ammonium sulphate ((NH4)2SO4) were tested for their abilities to enhance the removal of heavy metals Pb, Cd, Zn, and Cu by sweet sorghum from a contaminated agricultural soil. Sorghum plants always achieved the greatest removal of Pb by leaves and the greatest removal of Cd, Zn and Cu by stems. There was no significant difference among the Keller, Rio and Mray varieties of sweet sorghums in accumulating heavy metals. EDTA treatment was more efficient than ammonium nitrate and ammonium sulphate in promoting Pb accumulation in sweet sorghum from the contaminated agricultural soil. The application of ammonium nitrate and ammonium sulphate increased the accumulation of both Zn and Cd in roots of sorghum plants. Results from this study suggest that cropping of sorghum plants facilitated by agronomic practices may be a sustainable technique for partial decontamination of heavy metal contaminated soils. |
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Keywords: | Sorghum biocolor field trial phytoextraction |
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