Impact sur l'environnement de deux herbicides du maïs : la sulcotrione et l'atrazine : influence du changement d'apports organiques

Abstract : This study investigates the process at the origin of the become of sulcotrione in soil. We did investigate also the effect of various agricultural amendments on the dynamic of the molecule, in comparison to atrazine's. Adsorption characteristics of the molecules on soil were determined by the experiments led in batch. Degradation was followed through time in controlled conditions with incubation as weil as in natural conditions thanks to soil columns. These last were used to assess also leaching of the molecules. Results show a weak affinity of the sulcotrione with soil constituents (23% of the applied dose) as well as an easy desorption (99% of the applied dose) leading a weak hysteresis. It degradation in controlled conditions as well as natural was fairly rapid (20% mineralization, 40% of extractible residues and 30% of bound residues after 60 days). This led to the apparition of two metabolites with mainly CMBA. Percolates obtained in soil columns did confmn the mobility properties of the sulcotrione (14% of the applied dose) after a period of one month. The changes in organic amendments highlighted that the aggregates of soils amended with compost manure, in comparison to traditional amendment, showed a higher stability and a less developed network of interconnected macro-pores. These modifications decrease the availability of the intraaggregates adsorption sites towards pesticides. Our results hypothesize that we would tend towards same environmental difficultes if the sulcotrione was as much applied as atrazine.
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Theses
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http://docnum.univ-lorraine.fr/prive/INPL_T_2003_CHERRIER_R.pdf
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https://hal.univ-lorraine.fr/tel-01750138
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Submitted on : Thursday, March 29, 2018 - 12:38:56 PM
Last modification on : Wednesday, July 25, 2018 - 11:13:00 AM

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  • HAL Id : tel-01750138, version 1

Citation

Richard Cherrier. Impact sur l'environnement de deux herbicides du maïs : la sulcotrione et l'atrazine : influence du changement d'apports organiques. Sciences agricoles. Institut National Polytechnique de Lorraine, 2003. Français. ⟨NNT : 2003INPL076N⟩. ⟨tel-01750138⟩

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