Comparison of the behaviour of three herbicides in a field experiment under bare soil conditions

Siimes, Katri; Rämö, Sari; Welling, Leena; Nikunen, Unto; Laitinen, Pirkko

doi:10.1016/j.agwat.2006.01.007

Cited by 40 publications

(34 citation statements)

References 28 publications

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“…The surprisingly high loss of glyphosate by surface run-off (in one of the 3 field replications about 47% of the applied glyphosate) measured in this study confirmed the crucial effect of soil structure and preferential flow on the dissipation of glyphosate after heavy erosive precipitations, which were also be observed by other scientists (Borggaard and Gimsing, 2008;De Jonge et al, 2000;Gjettermann et al, 2009;Siimes et al, 2006, Vereecken, 2005. The contents of glyphosate and AMPA in the solid phase of run-off at the Cambisol are shown in Figs 7b, c, respectively.…”

Section: Field Replications Run-off Wc (Mm)supporting

confidence: 76%

Influence of soil tillage and erosion on the dispersion of glyphosate and aminomethylphosphonic acid in agricultural soils

Todorovic

Rampazzo

Mentler

et al. 2014

International Agrophysics

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A b s t r a c t. Erosion processes can strongly influence the dissipation of glyphosate and aminomethylphosphonic acid applied with Roundup Max® in agricultural soils; in addition, the soil structure state shortly before erosive precipitations fall can be a key parameter for the distribution of glyphosate and its metabolite. Field rain simulation experiments showed that severe erosion processes immediately after application of Roundup Max® can lead to serious unexpected glyphosate loss even in soils with a high presumed adsorption like the Cambisols, if their structure is unfavourable. In one of the no-tillage-plot of the Cambisol, up to 47% of the applied glyphosate amount was dissipated with surface run-off. Moreover, at the Chernozem site with high erosion risk and lower adsorption potential, glyphosate could be found in collected percolation water transported far outside the 2x2 m experimental plots. Traces of glyphosate were found also outside the treated agricultural fields.K e y w o r d s: glyphosate, aminomethylphosphonic acid, erosion, adsorption, soils

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Section: Field Replications Run-off Wc (Mm)supporting

confidence: 76%

Influence of soil tillage and erosion on the dispersion of glyphosate and aminomethylphosphonic acid in agricultural soils

Todorovic

Rampazzo

Mentler

et al. 2014

International Agrophysics

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“…However, maximal AMPA concentrations were reached after 14 days in their study corresponding to 79% of total glyphosate (Accinelli et al 2004) whereas it reached only 13% after 28 days in our study. The DT50 of glufosinate was close to the values found by Faber et al (1997) and Siimes et al (2006), respectively 4.3 and 7 days. Soil properties and microorganisms may explain variations of the rate and efficiency of degradation between studies.…”

Section: Degradation Kinetics Of Herbicides In Soilsupporting

confidence: 77%

Glyphosate and glufosinate-based herbicides: fate in soil, transfer to, and effects on land snails

et al. 2011

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International audiencePurpose The aim of this work was to assess the transfer and effects of two widely used herbicides on the land snail Helix aspersa during long-term exposure under laboratory conditions. Materials and methods Newly hatched snails were exposed for 168 days to soil and/or food contaminated with a formulation of glyphosate (BypassÂ®) or glufosinate (BastaÂ®) at the recommended field doses and also at 10-fold this dose. Results and discussion Herbicide degradation patterns showed that snails were mainly exposed during the first 28 days. The DT50 of glyphosate and glufosinate was established at 10.6 and 3.7 days, respectively. No significant effects on survival and growth were determined. Concerning genital tract maturation of the snails, exposure to herbicides tended to decrease the development of the albumen gland (inhibition of 43.5 Â± 32.8%). The presence of glyphosate (6 mg kg âˆ'1 dry weight) was demonstrated in snails exposed continuously to this active ingredient at the highest concentration in their food. Conclusions These results showed a low effect of herbicides at relevant concentrations in soil but the detection of residues in tissues indicated a potential risk of transfer to the food chain. This chronic toxicity bioassay could complete the available tests to assess toxicity of contaminants, and more particularly pesticides, in soil

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“…Translocation of glufosinate ammonium after absorption is highly variable (and species dependent) and is often limited by its fast action at the sites of contact resulting in rapid phytotoxicity (necrosis), though small rates of transportation, through phloem, to roots and floral parts have been reported (Steckel et al 1997;Beriault et al 1999;Pline et al 1999;Skora Neto et al 2000). The half-life of glufosinate in bare topsoil is fairly short (approximately 1 week); however, small amounts can still be detected in spring water run-off following snow melt (Siimes et al 2006). Estimates based on sales in Canadian provinces from 1994 to 2003 predict that approximately 211,500 kg ai (active ingredient) of glufosinate ammonium may be used annually in Canada ([50% in Manitoba), ranking it as the 15th mostly widely applied herbicide in the country (Brimble et al 2005).…”

Section: Herbicide Background Informationmentioning

confidence: 97%

Sublethal effects of the herbicide glufosinate ammonium on crops and wild plants: short-term effects compared to vegetative recovery and plant reproduction

Carpenter

Boutin

2010

Ecotoxicology

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Current guidelines for phytotoxicity testing rely heavily on short-term testing of primarily crop species to predict the sensitivity of non-target, wild plants to herbicides. However, little is known on how plants recover following initial growth inhibitions in standard 14-28 day greenhouse tests conducted for pesticide assessment and registration. The objectives of this study were to assess the ability of plant species to recover (biomass and reproduction) when tested at the juvenile stage (routine regulatory testing), comparing crop and wild species and using the herbicide glufosinate ammonium. Ten crops and 10 wild species were tested with a one-time exposure to glufosinate ammonium in a greenhouse. Half the plants of each species (9 doses × 6 replicates) were harvested 3 weeks after being sprayed (short-term). The remaining plants were harvested several weeks later, coinciding with seed set or natural senescence (long-term). Total aboveground biomass and several endpoints related to crop production and plant reproduction were measured. Calculated IC50 values (dosage that results in a 50% decrease in the biomass of a plant as compared to the untreated controls) based solely on aboveground biomass, for species harvested in the long-term were generally higher than those obtained in the short-term (with two exceptions), indicating recovery over time. Crop species did not differ from wild species in terms of sensitivity. However, in seven out of 12 cases where reproduction was measurable, reproductive endpoints were more sensitive than either short or long-term biomass endpoints, indicating the importance of examining these parameters in phytotoxicity testing. Glufosinate ammonium was found to be phytotoxic at low doses (2.64-7.74% g ai/ha of the label rate).

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Comparison of the behaviour of three herbicides in a field experiment under bare soil conditions

Cited by 40 publications

References 28 publications

Influence of soil tillage and erosion on the dispersion of glyphosate and aminomethylphosphonic acid in agricultural soils

Influence of soil tillage and erosion on the dispersion of glyphosate and aminomethylphosphonic acid in agricultural soils

Glyphosate and glufosinate-based herbicides: fate in soil, transfer to, and effects on land snails

Sublethal effects of the herbicide glufosinate ammonium on crops and wild plants: short-term effects compared to vegetative recovery and plant reproduction

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