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Cart![Toxicite Ferreuse Et Photosynthese Chez Le Riz En Afrique de L'Ouest = Toxicita(c) Ferreuse Et Photosyntha]se Chez Le Riz En Afrique de L'Ouest](/product/productimage/9786131577000.jpg)
Toxicite Ferreuse Et Photosynthese Chez Le Riz En Afrique de L'Ouest = Toxicita(c) Ferreuse Et Photosyntha]se Chez Le Riz En Afrique de L'Ouest
Paperback
Series: Omn.Univ.Europ.
Literary CriticismBotany & Horticulture
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ISBN10: 6131577005
ISBN13: 9786131577000
Publisher: Ed Universitaires Europeennes
Published: Dec 6 2013
Pages: 144
Weight: 0.49
Height: 0.34 Width: 6.00 Depth: 9.00
Language: French
ISBN13: 9786131577000
Publisher: Ed Universitaires Europeennes
Published: Dec 6 2013
Pages: 144
Weight: 0.49
Height: 0.34 Width: 6.00 Depth: 9.00
Language: French
La toxicite ferreuse est une contrainte edaphique couramment observee dans les perimetres rizicoles ouest-africains. Elle a fait l'objet, d'une enquete en Guinee, Cote d'ivoire et Ghana afin de quantifier ses effets sur la riziculture, et d'une etude experimental dans le but de determiner son effet sur l'activite photosynthetique du riz. Ainsi, plus de 4600 parcelles appartenant a 757 bas-fonds ont ete visitees. Ces etudes confirment que la toxicite ferreuse est une contrainte edaphique majeure des basfonds cultives car plus de 50% des bas-fonds, 60% des parcelles et plus de 55% des surfaces rizicoles sont affectees par le stress. L'impact sur le rendement est egalement significatif puisqu'il peut diminuer en moyenne jusqu'a 54 %. La toxicite ferreuse affecte l'appareil photosynthetique du riz notamment a travers un dysfonctionnement du PSII. Toutefois la variete CG14 raccourcirait son cycle vegetatif pour eviter les effets nefastes du stress. Les pertes importantes de rendement observe chez les varietes sensibles seraient dues a une reduction de la synthese de matiere organique et une perturbation de la reallocation des synthetisas vers les grains lors de la formation de ceux-ci.
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