Effect of seeding rate on flea beetle damage and agronomic performance of sized seeds of open-pollinated and hybrid Argentine canola in 2004-2006

Researcher: Bob Elliott, Larry Mann and Owen Olfert, Agriculture and Agri-Food Canada, Saskatoon, SK

Project Code: CARP 2004-14.4

Final Report: October 2007

Summary: The objective of this study was to investigate the effect of seeding rate on flea beetle damage and agronomic performance of open-pollinated (op) and hybrid Argentine canola. Certified seed lots of three herbicide-tolerant varieties were sieved through graded screens to obtain seeds of uniform diameter and weight. The sized seeds were planted in summer fallow at four rates ranging from 2.0-5.0 lb/acre. Flea beetle damage was below the economic threshold in all tests. Plant populations from sized seeds of the three varieties were remarkably similar over 3 test years. Plant densities increased as seeding rates increased. Sized seeds of a new hybrid variety had the highest shoot weights, highest biomass and highest seed yield. Over 3 years, a seeding rate of 5.0 lb/acre (5.6 kg/ha, 25 seeds/m-row) and plant density of 70-75 plants/m (squared) provided the highest yield in the op and older hybrid variety. A seeding rate of 4.0 lb/acre (4.5 kg/ha, 20 seeds/m-row) and plant density of 55-60 plants/m (squared) provided the highest yield in the new hybrid variety.

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