. Remerciements, Ce projet a été conduit dans le cadre de l'unité mixte technologique « Tournesol » avec l'appui financier du CTPS, Nous remercions les équipes expérimentales du CETIOM (en particulier A. Bertin, P. Cristante et P. Fauvin) et de l'UMR AGIR (M. Labarrère), 2007.

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