Effect of grass cover on water and pesticide transport through undisturbed soil columns, comparison with field study (Morcille watershed, Beaujolais)
2010
Dousset, S. | Thevenot, M. | Schrack, D. | Gouy, V. | Carluer, N. | Laboratoire des Interactions Microorganismes-Minéraux-Matière Organique dans les sols (LIMOS) ; Université Henri Poincaré - Nancy 1 (UHP)-Centre National de la Recherche Scientifique (CNRS) | Université de Lille, Sciences et Technologies | Unité expérimentale SAD - Station de Mirecourt (MIRECOURT) ; Institut National de la Recherche Agronomique (INRA) | Milieux aquatiques, écologie et pollutions (UR MALY) ; Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)
[Departement_IRSTEA]Eaux [TR1_IRSTEA]ARCEAU
Show more [+] Less [-]English. The purpose of this work is to assess the effectiveness of two grass covers (buffer zone and grass-covered inter-row), to reduce pesticide leaching, and subsequently to preserve groundwater quality. Lower amounts of pesticides leached through grass-cover soil columns (2.7e24.3% of the initial amount) than the bare soil columns (8.0e55.1%), in correspondence with their sorption coefficients. Diuron was recovered in higher amounts in leachates (8.9e32.2%) than tebuconazole (2.7e12.9%), in agreement with their sorption coefficients. However, despite having a sorption coefficient similar to that of diuron, more procymidone was recovered in the leachates (10.2e55.1%), probably due to its facilitated transport by dissolved organic matter. Thus even in this very permeable soil, higher organic matter contents associated with grass-cover reduce the amount of pesticide leaching and limit the risk of groundwater contamination by the pesticides. The results of diuron and tebuconazole transfer through undisturbed buffer zone soil columns are in agreement with field observations on the buffer zone.
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