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Travaux pratiques de physiologie végétale
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TD N°1Nutrition minérale
Méthodes d’étude quantitative des besoins
minéraux.
Ce TD est un compliment de cours il contient des
notions non abordées dans le cours
, Méthode uni-factorielle
Cette méthode consiste à choisir un sel contenant l'élément
étudier et à l'introduire dans le milieu sous diverses
concentrations. Les autres éléments sont maintenus à des
valeurs constantes. On mesure ensuite la croissance de la
plante après des temps définis.
, Par carence ou déficience, on désigne toute insuffisance
d'un élément nécessaire se traduisant par l'apparition de
symptômes pathologiques visibles. Cependant l’absence
de symptômes ne correspond pas automatiquement à
l’optimum alimentaire. Par contre tout élément même
nécessaire fourni à forte dose devient toxique.
L'application de cette méthode n'est pas simple car il
faut tenir compte de l’action des facteurs limitants et des
interactions entre éléments.
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