Mises à jour de ECHOcommunity

EDN Numéro 161 Maintenant disponible 2023-10-03


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Facteurs qui influent sur la germination des semences

le personnel de ECHO et les membres du réseau


Une autre cause importante de germination des semences ou de mauvaise germination des semis comprend le semis de graines trop profondes ou trop peu profondes. Si les graines sont semées trop profondément, la graine peut ne pas contenir assez d’énergie pour pousser la pousse hors du sol avant qu’elle n’épuise ses réserves de nourriture (endosperme). Si les graines sont semées trop peu profondément, les racines peuvent ne pas être ancrées assez profondément ou les graines peuvent se dessécher facilement. En règle générale, vous devez semer les graines à une profondeur de trois à quatre fois la largeur de la graine (Gilroy, 1986). Les petites graines ont besoin de peu ou pas de couverture de sol, mais sont extrêmement vulnérables au dessèchement, alors assurez-vous d’arroser fréquemment pendant les premières semaines de la vie de ces graines. Les graines plus grosses ont une plus grande quantité d’énergie pour pousser la première pousse (plumule) du sol et dans l’air au-dessus du sol. L’orientation de la graine semée n’est pas vitale car les graines sentent naturellement la gravité et enverront les pousses vers le haut et les racines vers le bas. 

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