Selenium accumulation in durum wheat and spring canola as a function of amending soils with selenite, selenate and or sulphate |
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Authors: | Julie Kikkert Beverley Hale Edward Berkelaar |
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Affiliation: | 1. School of Environmental Sciences, University of Guelph, Alexander Hall, 50 Stone Road East, Guelph, ON, Canada, N1G 2W1 2. Department of Environmental Science, Redeemer University College, 777 Garner Road East, Hamilton, ON, Canada, L9K 1J4
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Abstract: | Aims A comparison was performed between plant species to determine if extractable, rather than total soil Se, is more effective at predicting plant Se accumulation over a full growing season. Methods Durum wheat (Triticum turgidum L.) and spring canola (Brassica napus L.) were sown in potted soil amended with 0, 0.1, 1.0, or 5.0 mg kg?1 Se as SeO4 2? or SeO3 2?. In addition, SeO4 2?-amended soils were amended with 0 or 50 mg kg?1 S as SO4 2?. Soils were analyzed for extractable and total concentration of Se ([Se]). Twice during the growing season plants were harvested and tissue [Se] was determined. Results Plants exposed to SeO3 2? accumulated the least Se. Fitted predictive models for whole plant accumulation based on extractable soil [Se] were similar to models based on total [Se] in soil (R2?=?0.73 or 0.74, respectively) and selenium speciation and soil [S] were important soil parameters to consider. As well, soil S amendments limited Se toxicity. Conclusions Soil quality guidelines (SQGs) based on extractable Se should be considered for risk assessment, particularly when Se speciation is unknown. Predictive models to estimate plant Se uptake should include soil S, a modifier of Se accumulation. |
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