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Dégradation et potentiel polluant d'un produit phytosanitaire : l'atrazine

Abstract : Only a low percentage of the pesticide sprayed on a culture has a direct biocide action. The major part remains in the soil as extractable or non-extractable residues, like the parent product form or as degradation products. As a consequence, pesticide degradation study in soil is of great interest to assess its environmental impact. For example, concerning the most famous pesticide, atrazine, degradation kinetics seem highly variable depending on climate and soil characteristics. In order to clarify this point, atrazine degradation has been studied in two opposite pedoclimatical situations: oceanic or semi-continental climate, with different past treatments (no repeated atrazine treatment or 17 years atrazine treatment). Our data show biological degradation of atrazine in both cases but significant differences appear between the two cases. In the one hand (soil with repeated treatments), a high mineralization of the molecule occurs (up to 70 % of the applied amount in 4 months). In the other hand, mineralization is lower with only 15 % of the applied atrazine mineralized after 4 months. Consequently, less atrazine residues are available to leach in the first case and this can limit the underground water pollution. This situation shows that repeated use of one pesticide on the same field can lead to an adaptation phenomenon which reduces water pollution potential. This case is favourable for environment provided agricultural efficiency of the pesticide remains.
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Submitted on : Wednesday, April 28, 2021 - 6:07:20 AM
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Richard Cherrier, David Lapole, Corinne Perrin-Ganier, Michel Schiavon. Dégradation et potentiel polluant d'un produit phytosanitaire : l'atrazine. Déchets Sciences et Techniques, INSA de Lyon 2003, 30, pp.29-33. ⟨10.4267/dechets-sciences-techniques.2456⟩. ⟨hal-02681602⟩

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