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| Effects of mineral silicon fertilizer and microbial agent on uptake and accumulation of cadmiumby rice |
| Received:November 15, 2015 |
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| KeyWord:Cd pollution;rice;silicon fertilizers;microbial agents;combined application |
| Author Name | Affiliation | E-mail | | ZHANG Miao | College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China | | | YE Chang-cheng | College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China | | | YU Li | College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China | | | PENG Ou | College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China | | | ZHANG Yan | College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China | | | XU Meng | College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China | | | CHEN Zhe | College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China | | | TIE Bai-qing | College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China | tiebq@qq.com |
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| Abstract: |
| In pot and field experiments, the effects of base mineral silicon fertilizer and microbial agent alone and in combination on the concentrations of Cd in different parts and the yield of late rice were investigated during maturation period in Hunan region. Results showed that the microbial agent was more effective in reducing Cd accumulation in rice than mineral silicon fertilizer was. The Cd content in roots, leaves, sheaths and chaffs was 46.19%, 52.46%, 38.39% and 52.46% lower in microbial agent treatment than in CK, respectively. The mineral silicon fertilizer was more useful for reducing Cd content in the leaves, with 54.39% Cd reduction compared with CK in the pot experiment. In the field experiment, the mineral silicon fertilizer was the most effective in inhibiting Cd accumulation in roots, leaf sheaths and blades of rice among the three treatments, with a 73.91%, 71.28%, and 76.77% reduction in Cd content as compared with CK, respectively, while in microbial agent treatment the Cd content in chaff and brown rice reduced by 65.52% and 69.57%, respectively, compared with CK. In slightly contaminated soil, three treatments significantly reduced Cd content in brown rice, which was 0.09 mg·kg-1, 0.07 mg·kg-1, and 0.12 mg·kg-1 in silicon fertilizer, microbial agent and their combination, respectively, meeting the national food health standards(Cd<0.2 mg·kg-1). The yields of the rice were significantly increased by three treatments, with greatest yield increase found in combined silicon fertilizer and microbial agent treatment, in which there were 31.1% and 28.06% yield increases in the pot and field experiments, respectively, as compared with the CK. |
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