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| Effects of water management and fertilizer application on cadmium and arsenic accumulation in rice plants under filed condition |
| Received:May 02, 2018 |
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| KeyWord:rice;cadmium;arsenic;water management;silicon;sulfur;liming |
| Author Name | Affiliation | E-mail | | YAN Hui-jun | College of Resource Environment and Tourism, Capital Normal University, Beijing 100048, China
Department of Soil Environment Science, Research Center for Eco-Environment Sciences, Chinese Academy of Sciences, Beijing 100085, China | | | WANG Bo-xun | College of Resource Environment and Tourism, Capital Normal University, Beijing 100048, China
Department of Soil Environment Science, Research Center for Eco-Environment Sciences, Chinese Academy of Sciences, Beijing 100085, China | | | TANG Zhong | College of Resources and Environment Sciences, Nanjing Agricultural University, Nanjing 210095, China | | | YANG Yu-ping | Department of Soil Environment Science, Research Center for Eco-Environment Sciences, Chinese Academy of Sciences, Beijing 100085, China | | | WANG Xue-dong | College of Resource Environment and Tourism, Capital Normal University, Beijing 100048, China | | | DUAN Gui-lan | Department of Soil Environment Science, Research Center for Eco-Environment Sciences, Chinese Academy of Sciences, Beijing 100085, China | duangl@rcees.ac.cn | | ZHAO Fang-jie | College of Resources and Environment Sciences, Nanjing Agricultural University, Nanjing 210095, China | |
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| Abstract: |
| Rice contamination with cadmium(Cd) and/or arsenic(As) is an important environmental issue in South China, which seriously threatens the food safe and people health. Water management,fertilizer application and liming are considered to be economic, feasible and effective strategies for reducing Cd and As accumulation in rice grains, however, this still need to proved under filed condition. This study conducted a series of field trials in Hunan Province to investigate the effects of water management, fertilizer application and liming on Cd and As accumulation in rice plants. From year 2014 to 2016, the effects of three kinds of water managements on the accumulation of Cd and As in rice plants were conducted in Youxian and Xiangtan counties, including normal irrigation, flooding after flowering and flooding in full growth period. The results showed that flooding significantly reduced Cd concentration in brown rice, but increased As concentration. Comparing with normal irrigation, flooding after flowering and flooding in full growth period reduced Cd concentration in brown rice by 15%~30% and 26%~45%, but increased As concentration by 6%~25% and 11%~65%. From year 2016 to 2017, the effects of application of rice straw, silicon, sulfur or manganese, and their combing with lime on Cd and As accumulation in rice plants were studied in Xiangtan County. The results showed that the reduction of Cd and As accumulation by silicon and sulfur application was not stable, there are large variation between replications. Result suggested that, under field conditions, it was difficult to significantly reduce Cd and As in brown rice by single silicon application like in pot experiments. High dose of sulfur application(2250 kg·hm-2) could significantly reduce the As concentration in brown rice. The application of CaO(1500 kg·hm-2) had no significant effect on Cd concentration in brown rice. However, the application of CaCO3 (12 000 kg·hm-2) could significantly reduce Cd concentration of brown rice and straw, which decreased Cd concentration in the brown rice of Yongyou 538 by 54%. Thus, the application of CaCO3 with adequate amount could be an effective strategy for reducing Cd accumulation in rice grain. The results of this study demonstrated that appropriate water management and fertilizer application will significantly reduce As and Cd accumulation in rice grains. This study will provide practical guidance for optimizing the strategies of water and fertilizer managements for reducing Cd and As accumulation in rice grains. |
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