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| Effect of palygorskite immobilization combined with foliar silicon fertilizer application on Cd accumulation in rice |
| Received:June 24, 2016 |
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| KeyWord:palygorskite;immilization;foliar silicon fertilizer;cadmium;rice |
| Author Name | Affiliation | E-mail | | XU Yi | College of Resource and Environment, Hunan Agricultural University, Changsha 410128, China | | | LI Jian-rui | Taiyuan Institute of Technology, Taiyuan 030008, China
Innovative Team of Remediation for Heavy Metal Contaminated Farmland, Agro-Environmental Protection Institute of Ministry of Agriculture, Tianjin 300191, China | | | HUANG Qing-qing | Innovative Team of Remediation for Heavy Metal Contaminated Farmland, Agro-Environmental Protection Institute of Ministry of Agriculture, Tianjin 300191, China
Key Laboratory of Original Environmental Quality of Ministry of Agriculture, Tianjin 300191, China | | | LIANG Xue-feng | Innovative Team of Remediation for Heavy Metal Contaminated Farmland, Agro-Environmental Protection Institute of Ministry of Agriculture, Tianjin 300191, China
Key Laboratory of Original Environmental Quality of Ministry of Agriculture, Tianjin 300191, China | | | PENG Liang | College of Resource and Environment, Hunan Agricultural University, Changsha 410128, China | | | XU Ying-ming | Innovative Team of Remediation for Heavy Metal Contaminated Farmland, Agro-Environmental Protection Institute of Ministry of Agriculture, Tianjin 300191, China
Key Laboratory of Original Environmental Quality of Ministry of Agriculture, Tianjin 300191, China | ymxu1999@126.com |
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| Abstract: |
| Pot experiments were conducted to investigate the effect of palygorskite immobilization combined with foliar silicon fertilizer application on cadmium accumulation in rice. The results showed that foliar application of Si obviously increased the dry weight of grain(with husk) and straw in rice grown in Cd contaminated soil, reduced Cd concentrations in grain, husk and straw and the Cd translocation to shoot, while Cd was more sequestrated in root. In comparison with the control treatment, the foliar application of Si led to a maximal decrease in the Cd concentrations of 34.9% for the grain, 30.1% for the husk and 34.0% for the straw, respectively. And from the foliar application period of Si, the order of Cd reduction effect was spraying Si at the tillering stage plus full heading period > tillering stage > full heading period. Pot experiments results showed that the application of palygorskite could increase soil pH, reduce the bioavailability of Cd in soil and Cd concentration in rice. The addition of palygorskite decreased Cd contents by 39.5% for the grain, 28.6% for the husk, 35.3% for the straw and 20.9% for the root compared with the control, respectively. In addition, the combined effect of foliar application of Si and palygorskite immobilization were more effectively on Cd accumulation in rice, Cd contents in grain were reduced from 0.43 mg·kg-1 to less than national food safety standards of the rice cadmium 0.20 mg·kg-1, and the Cd concentration in rice root, straw, husk and rice decreased by 17.8%, 68.7%, 63.3% and 58.1%, respectively. |
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