Browsing Journal of Range Management, Volume 37, Number 6 (November 1984) by Subjects
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Establishment of Diffuse and Spotted Knapweed from Seed on Disturbed Ground in British Columbia, CanadaThe rangeland weeds diffuse and spotted knapweed (Centaurea diffusa L. and C. maculosa L.) were sown at densities of 208 to 1,504 seeds/m2 on disturbed rangeland in Westwold, British Columbia, in 25 × 25-cm plots. Both species established well to the rosettes stage at the lowest sowing densities, but only 5% of the diffuse knapweed rosettes bolted in the second year compared to 45% of the spotted knapweed rosettes. Intraspecific competition appeared to decrease the number of spotted knapweed rosettes bolting at the higher sowing densities.
