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1 January 2003 Harvest losses of canola (Brassica napus) cause large seedbank inputs
Robert H. Gulden, Steven J. Shirtliffe, A. Gordon Thomas
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The occurrence of volunteer canola has been increasing in western Canada. The objective of this study was to determine the canola seedbank additions incurred during crop harvest on commercial farms. Over 2 yr, 35 fields of 15 different producers were sampled after harvest using a vacuum cleaner. The canola seeds were separated from the crop residue and soil, and yield loss, 1,000-seed weight, and seedbank additions were determined for each field. Further information for each field was obtained through a producer survey questionnaire. Average yield losses of 107 kg ha−1 or 5.9% of the crop seed yield were observed. This amounted to seedbank additions of approximately 3,000 viable seeds m−2. The yield losses among producers ranged from 3.3 to 9.9% or 9 to 56 times the normal seeding rate of canola. Even with relatively low persistence rates, seedbanks of this magnitude could result in significant volunteer populations for several years, without further seedbank additions from escaped volunteers.

Nomenclature: Canola, Brassica napus L.

Robert H. Gulden, Steven J. Shirtliffe, and A. Gordon Thomas "Harvest losses of canola (Brassica napus) cause large seedbank inputs," Weed Science 51(1), 83-86, (1 January 2003).[0083:HLOCBN]2.0.CO;2
Received: 7 February 2002; Accepted: 6 June 2002; Published: 1 January 2003
harvest efficiency
weed seedbank
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