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| Risks of selenium and sepiolite use to reduce arsenic and cadmium uptake in rice under flooding conditions |
| Received:November 21, 2022 Revised:February 27, 2023 |
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| KeyWord:amino acid;selenium morphology;rice;combined pollution;cadmium and arsenic enrichment |
| Author Name | Affiliation | E-mail | | LI Zengfei | College of Resources and Environment, Fujian Agriculture & Forestry University, Fuzhou 350002, China | | | LIAO Guojian | College of Agriculture, Guangxi University, Nanning 530000, China | | | SHI Shengjie | College of Resources and Environment, Fujian Agriculture & Forestry University, Fuzhou 350002, China | | | LIN Xiaojun | Gaoling Town Agricultural Technology Popularization Station of Du'an County, Hechi 530700, China | | | LU Fangtao | Green Food Development Station, Huanjiang Maonan Autonomous County, Hechi 547000, China | | | LIU Xide | Agricultural Product Quality and Safety Inspection Station, Luocheng Mulam Autonomous County, Hechi 547000, China | | | HUANG Chichao | Hechi Agricultural Ecology and Resource Protection Station, Hechi 547000, China | | | LAN Jiayong | Plant Protection Station of Agricultural and Rural Bureau of Jinchengjiang District, Hechi City, Hechi 547000, China | | | FAN Zhilian | College of Agriculture, Guangxi University, Nanning 530000, China | | | FENG Renwei | College of Resources and Environment, Fujian Agriculture & Forestry University, Fuzhou 350002, China | frwzym@aliyun.com |
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| Abstract: |
| Selenium（Se） can inhibit the absorption of cadmium（Cd） and arsenic（As） in rice, and combined Se and passivator technologies have been applied in rice soil remediation. However, the risks of Se application with passivators have not been investigated. Using a full flooding condition, this study explored the applicability and risks of Se combined with passivators under rainy weather in the south of China. Either 30 mg·kg-1 or 50 mg·kg-1 sepiolite（SP30 and SP50, respectively）was used as a base fertilizer and 1 mg·L-1 or 5 mg·L-1 Se（Na2SeO3; Se1 and Se5, respectively）as a foliar fertilizer. Indexes were measured for soil rhizosphere（pH and Eh）and rice grain （mainly concentrations of Se speciation, amino acids, cadmium, arsenic, and selenium）. The results showed that compared to the CK treatment, adding Se or sepiolite alone had adverse effects on rice and promoted the enrichment of Cd or As in grains. Compared to treatment with SP30, Se1SP30 and Se5SP30 significantly increased seed setting rate and Cd concentration. Se5SP30 also significantly increased plant height and 200 grain weight. While the rice grain concentration of some amino acids increased with both treatments, a decrease in Ca and Fe was observed with both treatments, and Mg and Mn decreased in Se5SP30. Compared to treatment with SP50, Se1SP50 and Se5SP50 significantly reduced the shoot fresh weight, while treatment with Se5SP50 also reduced shoot yield and increased seed setting rate. Decreased grain concentrations of Fe and Zn were observed for both treatments, Mg and Ca with Se5SP50, and valine with Se1SP50. Increased grain concentrations of arginine and tryptophan were observed with both treatments. The concentrations of As and Cd in grains were not significantly affected with either treatment. The results of this study indicate that the use of Se or sepiolite increase the risk of As and Cd enrichment in rice grains under flooding conditions during the whole growth period. In practice, attention to water management is needed when using Se and sepiolite to remediate As or Cd contaminated soils. |
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