title: Fate of glyphosate and degradates in cover crop residues and underlying soil: A laboratory study.
abstract: The increasing use of cover crops (CC) may lead to an increase in glyphosate application for their destruction. Sorption and degradation of (14)C-glyphosate on and within 4 decaying CC-amended soils were compared to its fate in a bare soil. (14)C-Glyphosate and its metabolites distribution between mineralized, water-soluble, NH4OH-soluble and non-extractable fractions was determined at 5 dates during a 20 °C/84-d period. The presence of CC extends (14)C-glyphosate degradation half-life from 7 to 28 days depending on the CC. (14)C-Glyphosate dissipation occurred mainly through mineralization in soils and through mineralization and bound residue formation in decaying CC. Differences in sorption and degradation levels were attributed to differences in composition and availability to microorganisms. CC- and soil-specific dissipation patterns were established with the help of explicit relationships between extractability and microbial activity.
authors.affiliation: Université de Toulouse - École d'ingénieurs de Purpan, UMR 1248 AGIR - 75, Voie du TOEC BP 57 611, 31 076, Toulouse cedex 3, France; INRA, UMR 1402 ECOSYS, 78850 Thiverval-Grignon, France.
authors.forename: A
authors.initials: A
authors.lastname: Cassigneul
authors.affiliation: INRA, UMR 1402 ECOSYS, 78850 Thiverval-Grignon, France.
authors.forename: P
authors.initials: P
authors.lastname: Benoit
authors.affiliation: INRA, UMR 1402 ECOSYS, 78850 Thiverval-Grignon, France.
authors.forename: V
authors.initials: V
authors.lastname: Bergheaud
authors.affiliation: INRA, UMR 1402 ECOSYS, 78850 Thiverval-Grignon, France.
authors.forename: V
authors.initials: V
authors.lastname: Dumeny
authors.affiliation: INRA, UMR 1402 ECOSYS, 78850 Thiverval-Grignon, France.
authors.forename: V
authors.initials: V
authors.lastname: Etiévant
authors.affiliation: AgroParisTech, UMR 1402 ECOSYS, 78850 Thiverval-Grignon, France.
authors.forename: Y
authors.initials: Y
authors.lastname: Goubard
authors.affiliation: Université de Toulouse - École d'ingénieurs de Purpan, UMR 1248 AGIR - 75, Voie du TOEC BP 57 611, 31 076, Toulouse cedex 3, France.
authors.forename: A
authors.initials: A
authors.lastname: Maylin
authors.affiliation: INRA, UMR 1248 AGIR Auzeville - BP 52 627, 31 326, Castanet-Tolosan cedex, France.
authors.forename: E
authors.initials: E
authors.lastname: Justes
authors.affiliation: Université de Toulouse - École d'ingénieurs de Purpan, UMR 1248 AGIR - 75, Voie du TOEC BP 57 611, 31 076, Toulouse cedex 3, France.
authors.forename: L
authors.initials: L
authors.lastname: Alletto
mesh_terms: D018556:Crops, Agricultural / Q000737:chemistry*; D005998:Glycine / Q000031:analogs & derivatives* / Q000032:analysis; D006207:Half-Life; D006540:Herbicides / Q000032:analysis*; D007753:Laboratories; D008956:Models, Chemical; D012987:Soil / Q000737:chemistry*; D012989:Soil Pollutants / Q000032:analysis*; D000097797:Glyphosate
chemical_list: D005998:Glycine; D006540:Herbicides; D012987:Soil; D012989:Soil Pollutants; D000097797:Glyphosate
keywords: Bound residue formation; Degradation; Mineralization; Pesticide; Sorption