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Répartition des espèces de mauvaises herbes dans les cultures de maïs à Mardan, au Pakistan
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ISBN10: 6208971721
ISBN13: 9786208971724
Publisher: Editions Notre Savoir
Published: Jun 18 2025
Pages: 68
Weight: 0.23
Height: 0.16 Width: 6.00 Depth: 9.00
Language: French
ISBN13: 9786208971724
Publisher: Editions Notre Savoir
Published: Jun 18 2025
Pages: 68
Weight: 0.23
Height: 0.16 Width: 6.00 Depth: 9.00
Language: French
Les mauvaises herbes sont des espèces végétales indésirables qui poussent dans les cultures domestiquées. Comme d'autres cultures, le maïs est également confronté au problème de la concurrence avec les mauvaises herbes. Des pertes de rendement pouvant atteindre 70 % ont été signalées dans les petites exploitations agricoles en raison des mauvaises herbes. La composition et l'abondance des mauvaises herbes sont influencées par un certain nombre de variables environnementales ainsi que par les pratiques agricoles dans un écosystème. La présente étude a été conçue pour mesurer l'effet des variables environnementales sur la composition, l'abondance, le schéma de répartition et la formation de diverses communautés de mauvaises herbes dans le district de Mardan, au Pakistan. Des attributs phytosociologiques tels que la densité, la fréquence, la densité relative, la fréquence relative et les valeurs d'importance ont été mesurés pour chaque champ. Les données de présence ou d'absence de 29 espèces et 65 champs ont été analysées à l'aide d'analyses par grappes et par grappes bidirectionnelles via PC-ORD version 5, ce qui a permis d'identifier quatre communautés principales de mauvaises herbes. Le logiciel CANOCO version 4.5 a été utilisé pour évaluer les gradients environnementaux des mauvaises herbes à l'aide d'analyses de correspondance canonique (CCA).
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