Abstract
The booting stage and filling stage have been considered as the key stages for arsenic (As) uptake in rice. In this study, a field study was conducted to investigate the influence of the topdressing different amounts of silicon (Si) fertilizer at the key stages on rice As uptake and accumulation. The results showed that topdressing of a low amount of Si fertilizer at the booting stage and filling stage could increase rice yield, promote the formation of iron plaque and the retention of As on iron plaque, and reduce inorganic As content in brown rice. Compared with the control, the rice grain yield was increased by 22.60% with the topdressing of 20 kg·hm−2 Si fertilizer at the grain filling stage. As compared with the control, the Fe and As content in iron plaque under the topdressing of 20 kg·hm−2 Si fertilizer at the booting stage and filling stage was significantly (p < 0.05) increased by 84.34% and 87.78% (Fe content) and 70.96% and 63.80% (As content), respectively. Meanwhile, contents of As in rice roots, stems, and husks at the topdressing of 20 kg·hm−2 Si fertilizer at the booting stage were significantly (p < 0.05) reduced by 45.10%, 33.34%, and 31.23%, respectively, relative to the control. The lowest inorganic As content (0.21 mg·kg−1) in brown rice was obtained at the topdressing of 20 kg·hm−2 Si fertilizer at the booting stage, which was close to the National Food Limit Standard of 0.20 mg·kg−1 (GB 2762–2017). Therefore, topdressing of 20 kg·hm−2 Si fertilizer at the booting stage might be considered as an effective method to reduce inorganic As content in brown rice.
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The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.
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Funding
This study was supported by the Key Research and Development Program of Hunan Province (2021NK2027), the National Natural Science Foundation of Hunan Province (2021JJ31159 and 2022JJ40872), the Scientific Research Project of Education Department of Hunan Province of China (21B0223), Changsha Municipal Natural Science Foundation (kq2202287), and the Introduced Talent Research Startup Fund of Central South University of Forestry and Technology (2021YJ020).
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Peng Zeng: study conception and design, data collection and analysis, and writing—original draft. Penghui Deng: material preparation, study conception and design, data collection and analysis, and methodology. Hang Zhou: study conception and design, supervision, writing—review and editing, and funding acquisition. Jiaofeng Gu: review and editing and validation. Bohan Liao: review and editing and validation.
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Zeng, P., Zhou, H., Deng, P. et al. Effects of topdressing silicon fertilizer at key stages on uptake and accumulation of arsenic in rice. Environ Sci Pollut Res 30, 31309–31319 (2023). https://doi.org/10.1007/s11356-022-24365-y
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DOI: https://doi.org/10.1007/s11356-022-24365-y