Beres, B. L., Bremer, E. and Van Dasselaar, C. 2008. Response of irrigated corn silage to seeding rate and row spacing in southern Alberta. Can. J. Plant Sci. 88: 713Á716. A field study was conducted to determine if high seeding rates were economically beneficial for irrigated corn silage production in southern Alberta. On average, 84% of seeds produced a plant, with 12% higher plant establishment in narrow (38 cm) than wide (76 cm) rows. Row spacing did not significantly affect yield, but maximum profitability was attained with a lower seeding rate for narrow rows. Whole-plant dry matter yields and net income were increased by 13% when seeding rates were increased from 64 000 to 74 000 seeds ha(1 , but were not significantly affected by seeding rates from 74 000 to 114 000 seeds ha (1 . The ideal seeding rate within this range may vary due to site specific conditions. Forage quality was unaffected by seeding rate.Key words: Corn, Zea mays L., irrigated silage production, quality, plant population, row spacing Beres, B. L., Bremer, E. et Van Dasselaar, C. 2008. Re´action du maı¨s d'ensilage cultive´avec irrigation a`la densite´des semis et a`l'e´cartement des rangs dans le sud de l'Alberta. Can. J. Plant Sci. 88: 713Á716. Une e´tude sur le terrain a permis d'e´tablir s'il vaut e´conomiquement la peine d'augmenter la densite´des semis pour produire du maı¨s d'ensilage dans le sud de l'Alberta. En moyenne, 84 % des graines donnent un plant et les rangs peu espace´s (38 cm) rehaussent l'e´tablissement des plants de 12 %, comparativement aux rangs tre`s e´carte´s (76 cm). L'e´cartement des rangs n'affecte pas significativement le rendement, cependant on atteint la rentabilite´maximale avec une plus faible densite´de semis dans les rangs peu espace´s. Quand la densite´des semis passe de 64 000 a`74 000 graines par hectare, le rendement en matie`re se`che de la plante et le revenu net augmentent de 13 %, mais on ne note pas de changement important quand elle passe de 74 000 a1 14 000 graines par hectare. La densite´des semis ide´ale dans cette fourchette pourrait varier avec les conditions propres au site. La qualite´du fourrage n'est pas affecte´e par la densite´des semis.
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