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  • Assessing plant-available glyphosate in contrasting soils by diffusive gradient in thin-films technique (DGT)

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    Author(s)
    Wang, Zhe
    Rose, Michael T
    Tavakkoli, Ehsan
    Van Zwieten, Lukas
    Styles, Gavin
    Bennett, William
    Lombi, Enzo
    Griffith University Author(s)
    Bennett, Will W.
    Year published
    2019
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    Abstract
    Glyphosate represents one quarter of global herbicide sales, with growing interest in both its fate in soils and potential to cause non-target phytotoxicity to plants. However, assessing glyphosate bioavailability to plants from soil residues remains challenging. Here we demonstrate that the diffusive gradient in thin-films technique (DGT) can effectively measure available glyphosate across boundary conditions typical of the soil environment: pH 4–9, P concentrations of 20–300 μg P L−1 and NaHCO3 concentrations of 10–1800 mg L−1. In this study, four soils with different glyphosate sorption properties were dosed with up to ...
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    Glyphosate represents one quarter of global herbicide sales, with growing interest in both its fate in soils and potential to cause non-target phytotoxicity to plants. However, assessing glyphosate bioavailability to plants from soil residues remains challenging. Here we demonstrate that the diffusive gradient in thin-films technique (DGT) can effectively measure available glyphosate across boundary conditions typical of the soil environment: pH 4–9, P concentrations of 20–300 μg P L−1 and NaHCO3 concentrations of 10–1800 mg L−1. In this study, four soils with different glyphosate sorption properties were dosed with up to 16 mg kg−1 of glyphosate and phytotoxicity to wheat and lupin was measured against the DGT-glyphosate concentrations. An improved dose response curve was obtained for root elongation of wheat and lupin across soil types when DGT-glyphosate was used instead of alkaline-extractable (i.e., total extractable) glyphosate. Total extractable glyphosate concentrations of 2.6 and 5.0 mg glyphosate kg−1 in the sandy Tenosol, equivalent to 2.9 and 6.5 μg L−1 DGT-extractable glyphosate, reduced the root length of lupins (but not wheat) by 32–36% compared with the untreated control. DGT is therefore a promising method for assessing phytotoxic levels of glyphosate across different soils.
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    Journal Title
    SCIENCE OF THE TOTAL ENVIRONMENT
    Volume
    646
    DOI
    https://doi.org/10.1016/j.scitotenv.2018.07.221
    Copyright Statement
    © 2019 Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Licence, which permits unrestricted, non-commercial use, distribution and reproduction in any medium, providing that the work is properly cited.
    Subject
    Other environmental sciences
    Publication URI
    http://hdl.handle.net/10072/383269
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    • Journal articles

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