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| Effect of cropping system on Cd and Pb content in rice grains |
| Received:January 11, 2020 |
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| KeyWord:cropping system;rice;Pb;Cd |
| Author Name | Affiliation | E-mail | | LUO Fen | College of Agriculture, Hunan Agricultural University, Changsha 410128, China
South Regional Collaborative Innovation Center for Grain and Oil in China, Changsha 410128, China | | | ZHANG Yu-sheng | College of Agriculture, Hunan Agricultural University, Changsha 410128, China
South Regional Collaborative Innovation Center for Grain and Oil in China, Changsha 410128, China | | | ZHOU Liang | College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China | | | TIAN Wei | College of Agriculture, Hunan Agricultural University, Changsha 410128, China
South Regional Collaborative Innovation Center for Grain and Oil in China, Changsha 410128, China | | | XIAO Feng | College of Agriculture, Hunan Agricultural University, Changsha 410128, China
South Regional Collaborative Innovation Center for Grain and Oil in China, Changsha 410128, China | | | ZHANG Xiao-yi | College of Agriculture, Hunan Agricultural University, Changsha 410128, China
South Regional Collaborative Innovation Center for Grain and Oil in China, Changsha 410128, China | | | AO He-jun | College of Agriculture, Hunan Agricultural University, Changsha 410128, China
South Regional Collaborative Innovation Center for Grain and Oil in China, Changsha 410128, China | aohejun@126.com |
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| Abstract: |
| To compare the effects of different cropping systems on the concentrations of Pb and Cd in rice grains and changes thereof, a three-year field positioning experiment that began in 2016 was carried out in Hengyang and Yueyang. The levels and trends of Pb and Cd in rice grains were studied under three different cropping systems(Rice-Rice-Astragalus sinicus, Rice-Rice-Winter fallow, and RiceRice-Rape). The results showed that the content of Pb and Cd in rice grains first increased and then decreased. Three years after the implementation of the cropping system, compared with the Rice-Rice-Winter fallow cropping system, the Rice-Rice-Rape system significantly reduced the Cd content in the early and late rice grains, with average reductions of 23.90% and 47.30%, respectively. There was no significant difference between the Rice-Rice-Astragalus sinicus and the Rice-Rice-Winter fallow cropping systems. Compared with other cropping systems, the Rice-Rice-Astragalus sinicus cropping system significantly increased the Pb content in the early and late rice grains, with average increases of 50.42% and 80.49%, respectively. There was no significant difference between the Rice-Rice-Winter fallow and Rice-Rice-Rape systems. Compared with the first year of planting, the Rice-Rice-Rape cropping system can significantly improve the soil pH of Hengyang and Yueyang(by 8.60% and 10.33%, respectively), and significantly reduce the soil available Pb content(except for that of Hengyang)and available Cd content. The Rice-Rice-Astragalus sinicus cropping system can increase the soil available Pb content(by 17.51% and 13.32%, respectively). From the perspective of season, the Cd content of Zhongzao 39 in the late rice grains was significantly higher than that of early rice(118.93%~429.11%), while the content of Pb in the early rice grains was significantly higher than that of the late rice grains(10.71%~59.20%). In summary, the Rice-Rice-Rape cropping system should be selected as the main cropping system in heavy metal polluted areas of south China. |
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