Journal article
Assessing plant-available glyphosate in contrasting soils by diffusive gradient in thin-films technique (DGT)
The Science of the total environment, Vol.646, pp.735-744
01/01/2019
PMID: 30064100
Metrics
30 Record Views
UN Sustainable Development Goals (SDGs)
This output has contributed to the advancement of the following goals:
Source: InCites
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 mu g 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 mu g 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.
Details
- Title
- Assessing plant-available glyphosate in contrasting soils by diffusive gradient in thin-films technique (DGT)
- Creators
- Zhe Wang - NSW Department of Primary IndustriesMichael T. Rose - NSW Department of Primary IndustriesEhsan Tavakkoli - Charles Sturt UniversityLukas Van Zwieten - NSW Department of Primary IndustriesGavin Styles - Monash UniversityWilliam Bennett - Griffith UniversityEnzo Lombi - University of South Australia
- Publication Details
- The Science of the total environment, Vol.646, pp.735-744
- Publisher
- Elsevier
- Number of pages
- 10
- Grant note
- 50522GCAI-NIG 16 / Graham Center for Agricultural Innovation, Charles Sturt University
- Identifiers
- 991013054780502368
- Copyright
- (c) 2018 Elsevier B.V. All rights reserved.
- Academic Unit
- Faculty of Science and Engineering
- Language
- English
- Resource Type
- Journal article