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Poster De Conférence Année : 2011

Drift mitigation techniques for surface water protection: another French paradox ?

Techniques de réduction de la dérive pour la protection des eaux de surface : un autre paradoxe français ?

Résumé

Since the publication of the French Arretee 2006, Sept 12th , surface water is to be protected from aerial drift issued form spraying applications. Among practical measures, crop free buffer zones including vegetation strips were created along permanent and non permanent water courses (including ditches); spraying operation traceability was mandatory and drift mitigation techniques were to be implemented when chemicals spray free buzzer zone equals 20 to 50 m. When these 3 conditions are satisfied, the spray free buffer zone of chemicals can be reduced to 5 m. The accreditation of drift mitigation techniques is then subjected to a minimum reduction of drift values of 66 % compared to a reference's spraying technique (drift mitigation ratio of 3 at 5 m and beyond). Cemagref testing hall - ReducPol - located in Montpellier, was in charge of the accreditation scheme, through wind tunnel measurements. One hundred references of nozzles (used for field crop sprayers) are accredited. The situation nowadays faces new scientific challenges as spraying practices are evolving (e.g. increasing forward speed, boom height & flow pressure) and potentially lead to increase in drift. On the other hand, drift mitigation techniques are accredited when a threshold of 66 % drift reduction is achieved but the effective drift reduction ratio is not taken into account. The combination of those two aspects induces a paradoxical situation. This paper first introduces examples of drift values based on field tests as well as wind tunnel measurements with an emphasis to the impact of new spraying practices. Second, a focus on real drift mitigation performances of accredited nozzles is presented. The discussion focuses on environmental impact of pesticides application techniques that induces new technical but also political issues regarding the present regulation scheme.
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Dates et versions

hal-02596637 , version 1 (15-05-2020)

Identifiants

Citer

J.P. Douzals. Drift mitigation techniques for surface water protection: another French paradox ?. Euraqua-PEER Scientific Conference, Oct 2011, Montpellier, France. Peere Euraqua, pp.31-31, 2011. ⟨hal-02596637⟩
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