Adsorption of sugar beet herbicides to Finnish soils

Autio, S.; Siimes, Katri; Laitinen, Pirkko; Rämö, Sari; Oinonen, Seija; Eronen, Liisa

doi:10.1016/j.chemosphere.2003.10.015

Cited by 45 publications

(35 citation statements)

References 37 publications

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“…Its leaching via soil matrix is therefore improbable. Also our earlier studies using Finnish soils (Autio et al 2004) indicated high adsorption. Nevertheless, transport may occur via preferential pathways like macropores and cracks (de Jonge et al 2000;Kjaer et al 2005;Stone and Wilson 2006), probably together with colloidal particles.…”

Section: Introductionmentioning

confidence: 94%

Glyphosate translocation from plants to soil – does this constitute a significant proportion of residues in soil?

2007

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Translocation of glyphosate (N-(phosphonomethyl)glycine) to plant roots and its impact on detected herbicide residues in sandy loam soil were studied in a glasshouse pot experiment in Finland. Quinoa (Chenopodium quinoa, Willd) plants in two different growing phases (6-8 and 12-14 leaf stages, groups A and B, respectively) were sprayed with nonlabelled glyphosate. Bare soil pots were included as controls (group C). Soil surface contamination with glyphosate was prevented in groups A and B but not in group C. Soil samples were collected 1 h, 8 days and 44 or 53 days after the glyphosate applications. Root samples were taken 8 days after the application from group B. After 8 days from the treatment, 4% of the applied glyphosate was detected in soil and about 12% in roots (group B). One and a half months later 12% and 8% of the applied glyphosate (groups A and B, respectively) was detected in soil samples incubated with roots. The main metabolite of glyphosate, aminomethyl phosphonic acid (AMPA), was not found in root samples. Glyphosate fate was simulated with the PEARL 3.0 model. Simulated concentrations in bare soil pots were very close to the observed ones. However, the model lacks a process description for herbicide transport within a plant and, therefore, the observed and simulated glyphosate residues in soil after canopy applications did not correlate. Simulations highlight the importance of the translocation process in glyphosate fate. We conclude that also in field studies part of the detected glyphosate soil residues must originate from plant roots, and translocation process should be included both in leaching assessments and pesticide fate models.

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Section: Introductionmentioning

confidence: 94%

Glyphosate translocation from plants to soil – does this constitute a significant proportion of residues in soil?

2007

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“…In fact, for this herbicide, the variability of Koc is greater than that of the linear sorption coefficient Kd (Autio et al 2004;Mamy and Barriuso 2005). Despite the large number of studies reporting the sorption of glyphosate in different soil types, to our knowledge, no robust relationship has yet been developed between the glyphosate sorption coefficients and the aforementioned soil properties.…”

Section: Introductionmentioning

confidence: 96%

Glyphosate sorption to soils and sediments predicted by pedotransfer functions

2015

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Glyphosate is the most applied herbicide for weed control in agriculture worldwide. Excessive application of glyphosate induces water pollution. The transfer of glyphosate to freshwater and groundwater is largely controlled by glyphosate sorption to soils and sediments. Sorption coefficients are therefore the most sensitive parameters in models used for risk assessment. However, the variations in glyphosate sorption among soils and sediments are poorly understood. Here we review glyphosate sorption parameters and their variation with selected soils and sediment. We use this knowledge to build pedotransfer functions that allow predicting sorption parameters, Kd, Kf and n, for a wide range of soils and sediments. We gathered glyphosate sorption parameters, 101 Kf, n and equivalent Kd, and associated soil properties. These data were then used to perform stepwise multiple regression analyses to build the pedotransfer functions. The linear (Kd) and Freundlich (Kf, n) pedotransfer functions were benchmarked against experimental data. We found the following major points: (1) Under current environmental conditions, sorption is best predicted by the Kd pedotransfer function. (2) The pedotransfer function is Kd = 7.20*CEC -1.31*Clay ? 24.82 (Kd in L kg -1 , CEC in cmol kg -1 and clay in %). (3) Cation exchange capacity (CEC) and clay content are the main drivers of Kd variability across soils and sediments. Freundlich parameters are additionally influenced by pH and organic carbon. This suggests that the formation of complexes between glyphosate phosphonate groups and soil-exchanged polyvalent cations dominates sorption across the range of analyzed soils.

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“…After spraying glyphosate will be strongly sorbed to soil (Piccolo and Celano 1994;Tiberg 1998;de Jonge and de Jonge 1999;Gimsing and Borggaard 2001;Autio et al 2004;Mamy and Barriuso 2005) and thus its mobility is usually low. As an organophosphorus compound it is able to react with the same soil components as phosphates (Piccolo and Celano 1994;Gerritse et al 1996;Gimsing and Borggaard 2001;Wang et al 2005).…”

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confidence: 99%

Glyphosate and phosphorus leaching and residues in boreal sandy soil

et al. 2009

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Glyphosate [(N-(phosphonomethyl)glycine)] is a widely used herbicide and it is known to compete for the same sorption sites in soil as phosphorus. Persistence and losses of glyphosate were monitored in a field with low phosphorus status and possible correlation between glyphosate and phosphorus leaching losses was studied. Glyphosate and its metabolite AMPA (aminomethyl phosphonic acid) residues in soil samples were analysed after a single application in autumn. Twenty months after the application the residues of glyphosate and AMPA in the topsoil (0-25 cm) corresponded to 19% and 48%, respectively, of the applied amount of glyphosate, and traces of glyphosate and AMPA residues were detected in deeper soil layers (below 35 cm). These results indicate rather long persistence for glyphosate in boreal soils. Surface runoff and subsurface drainflow were collected continuously all year round for 20 months and analysed for glyphosate, AMPA, dissolved phosphate, total phosphorus and total suspended solids.The glyphosate concentrations in the surface runoff water were highest, with 99% of the total leaching losses obtained, during the periods of snow melting and soil thawing in the first winter following the autumn application. The total leaching of glyphosate was 5.12 g ha −1 and that of AMPA 0.48 g ha −1 , corresponding to about 0.51% and 0.07%, respectively, of the applied amount of glyphosate. No residues of glyphosate and AMPA were detected in the subsurface drainflow. The correlations between concentrations of glyphosate and dissolved orthophosphate as well as glyphosate and total phosphorus in surface runoff were significant (p<0.01).

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Adsorption of sugar beet herbicides to Finnish soils

Cited by 45 publications

References 37 publications

Glyphosate translocation from plants to soil – does this constitute a significant proportion of residues in soil?

Glyphosate translocation from plants to soil – does this constitute a significant proportion of residues in soil?

Glyphosate sorption to soils and sediments predicted by pedotransfer functions

Glyphosate and phosphorus leaching and residues in boreal sandy soil

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