Spatial variability of glyphosate mineralization and soil microbial characteristics in two Norwegian sandy loam soils as affected by surface topographical features

Stenrød, Marianne; Charnay, Marie-Paule; Benoît, Pierre; Eklo, Ole Martin

doi:10.1016/j.soilbio.2005.08.014

Cited by 41 publications

(28 citation statements)

References 34 publications

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“…Later the degradation seemed to slow down and both glyphosate and AMPA concentrations remained nearly constant up to the end of the study period. Similar time-dependent degradation results were obtained by Nomura and Hilton (1977), Heinonen-Tanski (1989) and Stenrød et al (2006). They demonstrated that after an initial rapid degradation of glyphosate the rate reached a constant value or, depending on soil properties, led to either a continually decreasing rate or the formation of bound residues.…”

Section: Discussionsupporting

confidence: 76%

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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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Section: Discussionsupporting

confidence: 76%

“…in a review study by Giesy et al (2000). The spatial variation of the glyphosate degradation rate is found to be high even within a single field (Stenrød et al 2006). Climatic factors, such as temperature and moisture, are crucial in terms of microbial activity (e.g.…”

mentioning

confidence: 98%

Glyphosate and phosphorus leaching and residues in boreal sandy soil

et al. 2009

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“…Biodegradation of herbicides constitutes a clear example of the importance of understanding the spatial distribution of soil microorganisms. Spatial variability in both glyphosate mineralization and general soil microbial characteristics, was observed even across small areas (decimeter scale) within a single field in two Norwegian sandy loam soils (Stenrød et al, 2006), reflecting the importance of soil physicochemical parameters controlled by surface topography. Similarly, Vieuble-Gonod et al (2005) reported that potential for 2,4-D mineralization was heterogeneous from field to microhabitats.…”

Section: Spatial Distribution Of Microbial Populationsmentioning

confidence: 99%

Herbicides in the Soil Environment: Linkage between Bioavailability and Microbial Ecology

Zabaloy¹,

Zanini²,

Bianchinotti³

et al. 2011

Herbicides, Theory and Applications

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“…Tillage also affects soil organic carbon location and sequestration as well as water retention properties. This may lead to different sorption and degradation properties depending on tillage practices (Alletto et al, 2008;Stenrød et al, 2006). In agricultural soils, soil structure is affected by compaction under wheel tracks.…”

Section: Effect Of Soil Structure On the Degradation Of Pesticides Inmentioning

confidence: 99%

“…Heterogeneity may persist several months after compost or stubble hiding depending on the nature of added organic matter. Another important driver of heterogeneity at the plot scale is linked to water retention properties as shown for the degradation of glyphosate (Stenrød et al, 2006) and isoxaflutole (Alletto et al, 2008).…”

Section: Relevant Scale and Influent Integrated Factorsmentioning

confidence: 99%