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24, chemin de Borde Rouge –Auzeville – CS52627
31326 Castanet Tolosan CEDEX - France

Dernière mise à jour : Mai 2018

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Welcome to ECOSYS

UMR ECOSYS - Ecologie fonctionnelle et écotoxicologie des agroécosystèmes

Offre CDD Modélisation

Utilisation de la modélisation pour comparer les flux de C et N au champ pendant 20 ans d’apport de différents produits résiduaires organiques dans le site expérimental PRO’sPective de l’INRA de Colmar en vue de rédiger un document de vulgarisation des résultats scientifiques

Contexte du travail


Le recyclage en agriculture des produits résiduaires organiques (PRO) provenant de l’agriculture (fumiers, lisiers, digestats d’effluents d’élevage…) ou des villes (boues d’épuration, composts de biodéchets, composts de boue, digestats de biodéchets) permet de recycler les nutriments et la matière organique qu’ils contiennent et contribue à l’économie circulaire des territoires. Cependant, gérer la fertilisation des cultures avec des matières organiques n’est pas aussi aisé qu’avec des engrais minéraux. Une partie de l’azote est sous forme organique et doit être minéralisée pour être disponible pour les cultures, Une partie de l’azote peut aussi être sous forme ammoniacale et générer des pertes par volatilisation. Les doses d’apports et la complémentation en engrais minéral éventuel peuvent provoquer des excès d’azote minéral dans les sols par rapport aux besoins des plantes et des pertes par lixiviation de nitrates. L’augmentation progressive de matière organique dans les sols augmente également progressivement la fourniture d’azote pour les plantes via la minéralisation de l’azote du sol. Tous ces flux sont simultanés, interagissent et évoluent au fur et à mesure des apports.