Competitive ability of hybrid and open-pollinated canola (Brassica napus) with wild oat (Avena fatua)

The competitiveness of three hybrid and three open-pollinated canola cultivars against two wild oat populations was determined under controlled environment conditions at two plant densities and five canola:wild oat ratios (100:0, 75:25, 50:50, 25:75, 0:100). Analysis of replacement series and deriva...

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Bibliographic Details
Published in:Canadian journal of plant science 2002-04, Vol.82 (2), p.473-480
Main Authors: Zand, E, Beckie, H.J
Format: Article
Language:English
Subjects:
Avena fatua
biomass
Brassica napus
competitive ability
crop yield
crop-weed competition
cultivars
data analysis
dry matter
hybrids
invasion
leaf area
open pollination
plant density
plant interaction
relative crowding coefficient method
replacement series
shoots
weed control
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Summary:The competitiveness of three hybrid and three open-pollinated canola cultivars against two wild oat populations was determined under controlled environment conditions at two plant densities and five canola:wild oat ratios (100:0, 75:25, 50:50, 25:75, 0:100). Analysis of replacement series and derivation of relative crowding coefficients (RCC), based on shoot dry weight or leaf area, indicated that hybrid canola cultivars were twice as competitive than open-pollinated cultivars when weed interference was relatively high (i.e., high plant density and vigorous wild oat growth). Little difference in competitiveness among cultivar types was apparent when weed interference was lower. The results of this study suggest that hybrid canola cultivars may be best suited for use in an integrated weed management program, particularly for farmers of organic or low input cropping systems. Key words: Hybrid canola, Brassica napus, Avena fatua, replacement series, competition
ISSN:0008-4220
1918-1833
DOI:10.4141/P01-149