Seed rates for soft white winter wheat in southwestern Ontario

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Abstract
This study was undertaken to determine the optimum seed rate for soft white winter wheat (Triticum aestivum L.) cultivars currently grown in southwestern Ontario (> 2900 corn heat units) where 65% of Ontario’s wheat is grown. The currently recommended density of 240–400 plants m−2 was determined using obsolete cultivars. Two popular cultivars, Harus, which tillers abundantly, and Rebecca, which tillers less, were grown from 100 to 600 seeds m−2 in increments of 100. The optimum seed rate for grain yield was 435 seeds m−2. This rate appears to be suitable for a range of genotypes adapted to southwestern Ontario. There was no interaction for yield among cultivars, years and locations. Yield was not related to tillering capacity, as the lower the plant density the more seeds there were per head. Key words: Wheat (winter), seed rate, tillering

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