Devenir des pesticides dans les sols en fonction de l'état d'humidité et du mode de circulation de l'eau dans le sol :

Abstract : The aqueous transfer of pesticides in agricultural soils involves their ability to potentially contaminate water resources. The present research focuses on the joint influence of the time and the water (humidity and dynamics in soil) on the downwards transfer of pesticides in soils. The investigation was led at three levels: the transfer of a pesticide (isoproturon) and a tracer (bromide) was studied within lysimeters, simulations of these transfers were carried out with the Agriflux model, the dissipation of pesticides was characterised under controlled laboratory conditions. At the soil profile scale, exportations of isoproturon and bromide in percolates highlighted a variability between soils due to hydrodynamic differences. Heterogeneity between replicates was also obvious. The transfer simulations of these molecules with Agriflux provided results consistent with the lysimetric observations while stressing the slow adsorption/desorption kinetics effects on the availability of isoproturon to transfer in mobile water. Laboratory experiments showed that: the initial soil moisture is related to the pesticide mobility ; also that the products diffuse within intra-aggregates immobile water ; and that the residence time increases the immobilisation of the pesticide in the soil
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Sophie Guimont. Devenir des pesticides dans les sols en fonction de l'état d'humidité et du mode de circulation de l'eau dans le sol :. Autre. Institut National Polytechnique de Lorraine, 2005. Français. ⟨NNT : 2005INPL087N⟩. ⟨tel-01752513⟩

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