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Effect of rate and date of seeding on yield and yield components of 2 winter wheat triticum aestivum cultivars fredrick and yorkstar grown in ontario canada



Effect of rate and date of seeding on yield and yield components of 2 winter wheat triticum aestivum cultivars fredrick and yorkstar grown in ontario canada



Canadian Journal of Plant Science 59(4): 939-944



Two cultivars of soft white winter wheat, 'Fredrick' and 'Yorkstar', were sown at rates of 34, 67, 101, 134 and 168 kg/ha on or near Sept. 24, Oct. 9 and Oct. 23 in each of the 3 yr 1973-1975, at Ridgetown, Ontario. Highest net yields were obtained with rate of seeding 134 kg/ha. Seeding rate did not affect lodging. Yield per hectare and spikes per hectare were positively correlated while kernels per spike and spikes per hectare were negatively correlated. As the rate of seeding was increased, the increase in the number of spikes per hectare was greater than the accompanying decrease in kernels per spike, resulting in a net overall increase in yield. Highest yields of 'Fredrick' were obtained near Oct.9 and those of 'Yorkstar' near Sept. 24. Yields decreased more rapidly with delayed seeding when seeding rates were < 134 kg/ha, especially with 'Yorkstar'. Test weight of 'Yorkstar' was low, especially when sown late. 'Fredrick' yielded 3-25% more than 'Yorkstar'. A delay in seeding beyond Oct. 9 resulted in a yield reduction of 23 kg/ha per day. 'Fredrick' should be sown instead of 'Yorkstar' when seeding is delayed beyond recommended dates of seeding.

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Accession: 005266092

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