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Fig. 2. Volunteer canola occurrence probabilities across all locations from 2001 to 2003. Rotation systems are wheat–pea–barley (WPB) or fallow–pea–fallow (FPF). Data are averaged across seeding systems to make ANOVA possible for all 2001 and 2002 intervals. Numbers above the data bars are the lower 95% confidence interval for the respective occurrence probability means. Occurrence probabilities are based on the proportion of quadrats in a particular treatment with at least one canola plant. P values show the statistical significance of the two rotation systems.
