Iron modification to silicon-rich biochar and alternative water management to decrease arsenic accumulation in rice (Oryza sativa L.)
Article
Article Title | Iron modification to silicon-rich biochar and alternative water management to decrease arsenic accumulation in rice (Oryza sativa L.) |
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ERA Journal ID | 5823 |
Article Category | Article |
Authors | Kumarathilaka, Prasanna (Author), Bundschuh, Jochen (Author), Seneweera, Saman (Author), Marchuk, Alla (Author) and Ok, Yong Sik (Author) |
Journal Title | Environmental Pollution |
Journal Citation | 286, pp. 1-10 |
Article Number | 117661 |
Number of Pages | 10 |
Year | 2021 |
Publisher | Elsevier |
Place of Publication | United Kingdom |
ISSN | 0269-7491 |
1873-6424 | |
Digital Object Identifier (DOI) | https://doi.org/10.1016/j.envpol.2021.117661 |
Web Address (URL) | https://www.sciencedirect.com/science/article/pii/S0269749121012434 |
Abstract | Production of rice grains at non-toxic levels of arsenic (As) to meet the demands of an ever-increasing population is a global challenge. There is currently a lack of investigation into integrated approaches for decreasing As levels in rice agro-ecosystems. By examining the integrated iron-modified rice hull biochar (Fe-RBC) and water management approaches on As dynamics in the paddy agro-ecosystem, this study aims to reduce As accumulation in rice grains. The rice cultivar, Ishikari, was grown and irrigated with As-containing water (1 mg L−1 of As(V)), under the following treatments: (1) Fe-RBC-flooded water management, (2) Fe-RBC-intermittent water management, (3) conventional flooded water management, and (4) intermittent water management. Compared to the conventional flooded water management, grain weight per pot and Fe and Si concentrations in the paddy pore water under Fe-RBC-intermittent and Fe-RBC-flooded treatments increased by 24%–39%, 100%–142%, and 93%–184%, respectively. The supplementation of Fe-RBC decreased the As/Fe ratio and the abundance of Fe(III) reducing bacteria (i.e. Bacillus, Clostridium, Geobacter, and Anaeromyxobacter) by 57%–88% and 24%–64%, respectively, in Fe-RBC-flooded and Fe-RBC-intermittent treatments compared to the conventional flooded treatment. Most importantly, Fe-RBC-intermittent treatment significantly (p ≤ 0.05) decreased As accumulation in rice roots, shoots, husks, and unpolished rice grains by 62%, 37%, 79%, and 59%, respectively, compared to the conventional flooded treatment. Overall, integrated Fe-RBC-intermittent treatment could be proposed for As endemic areas to produce rice grains with safer As levels, while sustaining rice yields to meet the demands of growing populations. |
Keywords | rice; inorganic arsenic; iron-biochar; microorganisms; silicon |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 410405. Environmental rehabilitation and restoration |
410404. Environmental management | |
410501. Environmental biogeochemistry | |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | School of Civil Engineering and Surveying |
Centre for Crop Health | |
Centre for Sustainable Agricultural Systems | |
Korea University | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q677z/iron-modification-to-silicon-rich-biochar-and-alternative-water-management-to-decrease-arsenic-accumulation-in-rice-oryza-sativa-l
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