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PAEF_Module 4


Qu'est-ce l'eutrophisation? C'est le phosphore qui limite les écosystèmes naturels par l'accumulation du phosphore dans lac. Ceci engenre la prolifération d'algues et diminutiion de l'O2.
Quel est le seuil d'eutrophisation pour les cours d'eau? 0,03 mg P total / l
Quelles sont les formes de phosphore retrouvée dans les sol et à quelle pH les retrouve t-on? Du plus acide au plus basique : H3PO4 -> H2PO4- -> HPO42- -> PO43-
Compléter la phrase : Plus le sol est _____, plus il a de proton et plus le _____ se colle aux _____. Plus le sol est _____, plus il y a d'anion et plus le _____ est collé aux ______. - acide - H3PO4 - basique - PO43-
Compléter la phrase, le phosphore est disponible à un pH _____. neutre
Quelles sont les facteurs sources (4) et les facteurs transports (5) du phosphore. Quelle facteur vise les règlements? Sources : richesse du sol, pratiqus culturales, fertilisation, entreposage. Transports : Hydrologie, érosion, ruissellement, lessivage, drainage. Source : richesse du sol et entreposage
Décrire les modèles de commandation en quoi elle vise (agronomique, environnemental, économique, agroenvironnementl). Agronomique = rendement et qualité Environnemental = limiter pertes Économiques = prix engrais et récolte Agroenvironnementaux : se retrouve au centre les trois premiers diagnostics.
Created by: Isabelle L.



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