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| Effects of phosphorus and silicon applications on arsenic accumulation in rice grains in South China |
| Received:August 25, 2015 |
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| KeyWord:arsenic accumulation;phosphorus and silicon fertilizer;rice;pot experiment;South China |
| Author Name | Affiliation | E-mail | | ZHANG Lin | College of Resource and Environment, Huazhong Agricultural University, Wuhan 430070, China
College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China | | | LU Ying | College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China | luying@scau.edu.cn |
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| Abstract: |
| Phosphorus(P) and silicon(Si) have showed the ability to reduce arsenic(As) uptake by plants from soils. Here a pot experiment was conducted in a soil spiked with 50 mg·kg-1 arsenic to study the effects of different rates of phosphorus and silicon fertilizers on growth and arsenic accumulation of a hybrid rice cultivar, PeizaTaifeng, which is widely planted in South China. Results showed that after applications of phosphorus and silicon fertilizers,arsenic content in rice grains ranged from 0.504 to 0.586 mg·kg-1, lower than the limit of arsenic in rice grains(NY 861—2004) enacted by the China Ministry of Agriculture. Correlation analyses showed that arsenic content in rice grains had significantly negative correlation with rice plant biomass, thousand seed weight, Si/As molar ratio in straw, and extremely significant negative correlation with P/As molar ratio in straw. Arsenic concentrations in grains decreased with increasing rates of phosphorus and silicon fertilizers. The present findings suggest that the optimum application rates of phosphorus and silicon fertilizers for rice grown in arsenic polluted soil would be 40 mg P·kg-1 soil and 50 mg Si·kg-1 soil in the South China area. |
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