Impact sur l'environnement d'un herbicide non sélectif, le glyphosate : approche modélisée en conditions contrôlées et naturelles

Abstract : The main processes and factors which influence glyphosate fate in soils and the risks of water resources contamination were studied. Its adsorption in the soils was very fast and intense (Kf between 16.6 to 34.5 depending on the soil) and the effect of pH on this process was confirmed: adsorption decreases when soil pH increased. In addition, glyphosate was slightly desorbed and its degradation in controlled or natural conditions was fast, but its kinetics was very variable according to the biological activity of the soils. Degradation led to the formation of the metabolite (AMPA), which tends to accumulate in the soil. The experimentation in columns of different soils confirmed the low mobility of the glyphosate and the AMPA. The residues exported by the leachates after more than 332 days represented less than 0.28% of the amount applied. The hydrodynamic properties of the soil and the pluviometry observed had a significant effect on the leaching of the residues.
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Abdul Jabbar Al Rajab. Impact sur l'environnement d'un herbicide non sélectif, le glyphosate : approche modélisée en conditions contrôlées et naturelles. Sciences de la Terre. Institut National Polytechnique de Lorraine, 2007. Français. ⟨NNT : 2007INPL039N⟩. ⟨tel-01752951⟩

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