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Cultivar and Seeding Rate Effects on the Competitive Ability of Spring Cereals Grown under Organic Production in Northern Canada

^a Dep. of Agricultural, Food and Nutritional Science, Univ. of Alberta, Edmonton, AB, T6G 2P5
^b Dep. of Plant Sciences, Univ. of Saskatchewan, 51 Campus Dr., Saskatoon, SK, S7N 5A8
^c Agriculture and Agri-Food Canada, Lacombe Research Centre, 6000 C & E Trail, Lacombe, AB, T4L 1W1

View larger version (26K): [in this window] [in a new window]   Fig. 1. Interaction between competition from oat and crop cultivar on (A) grain yield and (B) kernels per spike of wheat and barley cultivars grown at four locations in 2003 and 2004 at Edmonton, AB, and New Norway, AB. Peregrine and Seebe are barley cultivars, others are wheat. Within each cultivar and trait, bars with * differ significantly at P < 0.05 according to the LSD.

View larger version (21K): [in this window] [in a new window]   Fig. 2. Relationship between grain yield and total weed biomass without additional competition from (A) tame oat and (B) total weed biomass with tame oat competition of wheat and barley cultivars grown at four locations in 2003 and 2004 at Edmonton, AB, and New Norway, AB. Peregrine and Seebe are barley cultivars, others are wheat. Solid lines represent means and dotted lines represent upper and lower 95% confidence limits.