Critical period of weed control in spring canola

By S. Martin, R. V. van Acker, L. Friesen. Weed science, 2001

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Conventional- and conservation-tillage systems influence emergence periodicity of annual weed species in canola (2003, background): “This may be primarily a result of higher temperature requirements for germination of these two species in comparison with the other weed species and canola (Blackshaw et al. 1981; Martin et al. 2000; Weaver and McWilliams 1980).”
Row Spacing Influences the Critical Timing for Weed Removal in Soybean (Glycine max)1 (2003, background): “GDD can be also related to the crop growth stage, which can be quickly assessed in the field, and then conveyed more easily to producers, consultants, and other field personnel (Knezevic et al. 2002; Martin et al. 2001).”
Critical period for weed control: the concept and data analysis (2002, background): “Some have suggested that the variability inherent with this concept may appear to negate its usefulness (Gunsolus and Buhler 1999) and that its utility should be carefully judged (Mohler 2001).”