Weedy and weed-free yields were determined in fields of barley, canola, and
peas in Lacombe County, Alberta, Canada from 1995 to 1997. Yield losses we
re most frequent and severe in peas, and least frequent and less severe in
barley. Yield losses due to weed competition were not detectable at 33, 60,
and 73% of the pea, canola, and barley sites, respectively.