- Title
- Impact of water and fertilizer management on arsenic bioaccumulation and speciation in rice plants grown under greenhouse conditions
- Creator
- Islam, Shofiqul; Rahman, Mohammad Mahmudur; Naidu, Ravi
- Relation
- Chemosphere Vol. 214, Issue January 2019, p. 606-613
- Publisher Link
- http://dx.doi.org/10.1016/j.chemosphere.2018.09.158
- Publisher
- Elsevier
- Resource Type
- journal article
- Date
- 2019
- Description
- Arsenic (As), a non-threshold class I carcinogen, is a main source of human exposure to inorganic As for billions of people worldwide. Rice is much more effectual in accruing As into its grain and other parts. Therefore, strategies to reduce As accumulation in rice should be adopted. The impact of water [Alternate Wetting and Drying (AWD), incessant flooding (CF)] and fertilizer management [Silicon (Si@ control, 10 and 20 mg/kg soil) and Phosphorus (P@ control, 12.5 and 25.0 mg/kg soil)] on the bioaccumulation of As in rice plants under different As-graded paddy soils (control, 10, 20 mg/kg) using an Australian rice variety (cv. Sherpa) was investigated under greenhouse conditions. Results indicated that, arsenite accounted for >80% of the total inorganic As in pore water and total As concentration declined from 933 μg/L to 177 μg/L with time. AWD irrigation practice with Si fertilization significantly reduced the total As levels in pore water. Arsenic concentration in different rice plant tissues showed significant variations due to water and fertilizer management. Lower concentrations of As in rice grains were observed using AWD (average 93.0 μg/kg) than those observed in CF (average 121 μg/kg) irrigation practice. The addition of Si also significantly (p < 0.03) decreased As uptake by rice plants while adding of P has no significant effect and this is also true for Si and P interaction. AWD irrigation practice with Si fertilization resulted in a reduction of grain As level at around 12%–21%, while grain yield increased by 13%.
- Subject
- arsenic; bioaccumulation; water management; fertilizer management; grain yield
- Identifier
- http://hdl.handle.net/1959.13/1422451
- Identifier
- uon:37835
- Identifier
- ISSN:0045-6535
- Language
- eng
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