Behaviour of S-metolachlor and its oxanilic and ethanesulfonic acids metabolites under fresh vs. partially decomposed cover crop mulches: A laboratory study
At the time of spring pre-emergent herbicide application, the soil surface in conservation agriculture is most of the time covered by cover crops (CC) mulches. The state of these mulches depends on their destruction date and on the selected species. Sorption and degradation of 14C-S-metolachlor on and within 8 decaying CC-covered (2 species × 4 initial decomposition state) soils corresponding to conservation agriculture were compared to its fate in bare soil (BS) corresponding to conventional agriculture. 14C-S-metolachlor and its metabolites distribution between mineralized, extractable and non-extractable (NER) fractions was determined at 5 dates during a 20 °C/84-d period. Herbicide mineralization was weak (<2%) for both CC and BS. Extractability of 14C in BS was intermediate between CC that were decomposed 28 or 56 days and 0 or 6 days before application. Degradates consisted in up to 43% of total radioactivity, with specificities according to the CC or soil compartment. NER formation was equivalent in BS and in the much decomposed CC-amended microcosms, and was stronger in less decomposed CC. S-metolachlor DT50 was 23-d in BS, and 9, 15, 39 and 25-d for CC ordered by increased decomposition state at the time of application. These results were attributed to the proportion of 14C intercepted by CC, and to higher levels of organic matter and microbial activity in less decomposed CC as compared with more decomposed ones. Then the state of decomposition level of CC residues determines the behaviour of SMOC (S-metolachlor) sprayed on the mulch in the conditions of conservation agriculture.
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dig-cirad-fr-5876142022-10-26T16:00:40Z http://agritrop.cirad.fr/587614/ http://agritrop.cirad.fr/587614/ Behaviour of S-metolachlor and its oxanilic and ethanesulfonic acids metabolites under fresh vs. partially decomposed cover crop mulches: A laboratory study. Cassigneul Ana, Benoit Pierre, Nobile Cécile, Bergheaud Valérie, Dumeny V., Etiévant V., Maylin A., Justes Eric, Alletto Lionel. 2018. Science of the Total Environment, 631-632 : 1515-1524.https://doi.org/10.1016/j.scitotenv.2018.03.143 <https://doi.org/10.1016/j.scitotenv.2018.03.143> Researchers Behaviour of S-metolachlor and its oxanilic and ethanesulfonic acids metabolites under fresh vs. partially decomposed cover crop mulches: A laboratory study Cassigneul, Ana Benoit, Pierre Nobile, Cécile Bergheaud, Valérie Dumeny, V. Etiévant, V. Maylin, A. Justes, Eric Alletto, Lionel eng 2018 Science of the Total Environment H01 - Protection des végétaux - Considérations générales P33 - Chimie et physique du sol At the time of spring pre-emergent herbicide application, the soil surface in conservation agriculture is most of the time covered by cover crops (CC) mulches. The state of these mulches depends on their destruction date and on the selected species. Sorption and degradation of 14C-S-metolachlor on and within 8 decaying CC-covered (2 species × 4 initial decomposition state) soils corresponding to conservation agriculture were compared to its fate in bare soil (BS) corresponding to conventional agriculture. 14C-S-metolachlor and its metabolites distribution between mineralized, extractable and non-extractable (NER) fractions was determined at 5 dates during a 20 °C/84-d period. Herbicide mineralization was weak (<2%) for both CC and BS. Extractability of 14C in BS was intermediate between CC that were decomposed 28 or 56 days and 0 or 6 days before application. Degradates consisted in up to 43% of total radioactivity, with specificities according to the CC or soil compartment. NER formation was equivalent in BS and in the much decomposed CC-amended microcosms, and was stronger in less decomposed CC. S-metolachlor DT50 was 23-d in BS, and 9, 15, 39 and 25-d for CC ordered by increased decomposition state at the time of application. These results were attributed to the proportion of 14C intercepted by CC, and to higher levels of organic matter and microbial activity in less decomposed CC as compared with more decomposed ones. Then the state of decomposition level of CC residues determines the behaviour of SMOC (S-metolachlor) sprayed on the mulch in the conditions of conservation agriculture. article info:eu-repo/semantics/article Journal Article info:eu-repo/semantics/publishedVersion http://agritrop.cirad.fr/587614/1/1-s2.0-S0048969718309021-main.pdf text Cirad license info:eu-repo/semantics/restrictedAccess https://agritrop.cirad.fr/mention_legale.html https://doi.org/10.1016/j.scitotenv.2018.03.143 10.1016/j.scitotenv.2018.03.143 info:eu-repo/semantics/altIdentifier/doi/10.1016/j.scitotenv.2018.03.143 info:eu-repo/semantics/altIdentifier/purl/https://doi.org/10.1016/j.scitotenv.2018.03.143 |
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H01 - Protection des végétaux - Considérations générales P33 - Chimie et physique du sol H01 - Protection des végétaux - Considérations générales P33 - Chimie et physique du sol |
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H01 - Protection des végétaux - Considérations générales P33 - Chimie et physique du sol H01 - Protection des végétaux - Considérations générales P33 - Chimie et physique du sol Cassigneul, Ana Benoit, Pierre Nobile, Cécile Bergheaud, Valérie Dumeny, V. Etiévant, V. Maylin, A. Justes, Eric Alletto, Lionel Behaviour of S-metolachlor and its oxanilic and ethanesulfonic acids metabolites under fresh vs. partially decomposed cover crop mulches: A laboratory study |
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At the time of spring pre-emergent herbicide application, the soil surface in conservation agriculture is most of the time covered by cover crops (CC) mulches. The state of these mulches depends on their destruction date and on the selected species. Sorption and degradation of 14C-S-metolachlor on and within 8 decaying CC-covered (2 species × 4 initial decomposition state) soils corresponding to conservation agriculture were compared to its fate in bare soil (BS) corresponding to conventional agriculture. 14C-S-metolachlor and its metabolites distribution between mineralized, extractable and non-extractable (NER) fractions was determined at 5 dates during a 20 °C/84-d period. Herbicide mineralization was weak (<2%) for both CC and BS. Extractability of 14C in BS was intermediate between CC that were decomposed 28 or 56 days and 0 or 6 days before application. Degradates consisted in up to 43% of total radioactivity, with specificities according to the CC or soil compartment. NER formation was equivalent in BS and in the much decomposed CC-amended microcosms, and was stronger in less decomposed CC. S-metolachlor DT50 was 23-d in BS, and 9, 15, 39 and 25-d for CC ordered by increased decomposition state at the time of application. These results were attributed to the proportion of 14C intercepted by CC, and to higher levels of organic matter and microbial activity in less decomposed CC as compared with more decomposed ones. Then the state of decomposition level of CC residues determines the behaviour of SMOC (S-metolachlor) sprayed on the mulch in the conditions of conservation agriculture. |
format |
article |
topic_facet |
H01 - Protection des végétaux - Considérations générales P33 - Chimie et physique du sol |
author |
Cassigneul, Ana Benoit, Pierre Nobile, Cécile Bergheaud, Valérie Dumeny, V. Etiévant, V. Maylin, A. Justes, Eric Alletto, Lionel |
author_facet |
Cassigneul, Ana Benoit, Pierre Nobile, Cécile Bergheaud, Valérie Dumeny, V. Etiévant, V. Maylin, A. Justes, Eric Alletto, Lionel |
author_sort |
Cassigneul, Ana |
title |
Behaviour of S-metolachlor and its oxanilic and ethanesulfonic acids metabolites under fresh vs. partially decomposed cover crop mulches: A laboratory study |
title_short |
Behaviour of S-metolachlor and its oxanilic and ethanesulfonic acids metabolites under fresh vs. partially decomposed cover crop mulches: A laboratory study |
title_full |
Behaviour of S-metolachlor and its oxanilic and ethanesulfonic acids metabolites under fresh vs. partially decomposed cover crop mulches: A laboratory study |
title_fullStr |
Behaviour of S-metolachlor and its oxanilic and ethanesulfonic acids metabolites under fresh vs. partially decomposed cover crop mulches: A laboratory study |
title_full_unstemmed |
Behaviour of S-metolachlor and its oxanilic and ethanesulfonic acids metabolites under fresh vs. partially decomposed cover crop mulches: A laboratory study |
title_sort |
behaviour of s-metolachlor and its oxanilic and ethanesulfonic acids metabolites under fresh vs. partially decomposed cover crop mulches: a laboratory study |
url |
http://agritrop.cirad.fr/587614/ http://agritrop.cirad.fr/587614/1/1-s2.0-S0048969718309021-main.pdf |
work_keys_str_mv |
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