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Evaluation des émissions de nitrate par les champs pour la conception de projets de territoire et l’accompagnement de la transition en aires d’alimentation de captage

Abstract : Since the 2000’s the policy for the protection of catchment areas is based on territorial action plan, the success of which is assessed by practices analysis. This assessment is mobilized to estimate pollutants emissions from fields (according to the cropping system) and the ability to maintain a good water quality. The methods for assessment of nitrate emissions was studied in territorial diagnosis of agricultural pressures in the catchment area of Saint Memmie (Marne) and in the setting up of the action plan in Brienon (Yonne).Nitrogen measurements in soil and the reporting of biomass and nitrogen quantities for crops are organized in an “observatory” of practices and cultivated fields’ states. They remain the most appropriate tool to estimate nitrates emissions and nitrogen dynamics but also to mobilize local actors. Simulation tools like Syst’N have a complementary role in extrapolating emissions from measurements to the whole territory, estimating nitrate leaching and expected water quality, like in a dashboard. They are also used to evaluate new cropping systems and scenarios for the territory.
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Raymond Reau, Magali Bedu, Claudine Ferrané, Jean-Baptiste Gratecap, Soizic Jean-Baptiste, et al.. Evaluation des émissions de nitrate par les champs pour la conception de projets de territoire et l’accompagnement de la transition en aires d’alimentation de captage. Innovations Agronomiques, INRAE, 2017, 57 (Juin 2017), pp.99-115. ⟨10.15454/1.5137819587418933E12⟩. ⟨hal-01783986⟩

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