Spotted knapweed response to season and frequency of mowing
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Authors: M. J. Rinella, J. S. Jacobs, R. L. Sheley, and J. J. Borkowski
Date: 2001
Journal: Journal of Range Management
Volume: 54
Number: 1
Pages: 52-56
Summary of Methods: The response of spotted knapweed and perennial grass to 16 mowing treatments (combinations of spring, summer, fall and no mowing) at 2 sites over 3 years. Site 1 was south of Belgrade, MT (45° 47' N; 111° 10' W) and site 2 was southwest of Bozeman, MT (45° 36' N; 111° 5' W). Sites were mowed with the blade set at 10 cm above ground surface.
Article Summary / Main Points: A single fall mowing when spotted knapweed was in flowering or seed producing stages had as much effect on spotted knapweed cover and density as other multi-frequency mowings. Seedling density response to the mowing varied between the study sites and adult density varied by year. Season of mowing appears to be more significant than frequency of defoliation spotted knapweed populations.
Vegetation Types: Intermountain Grasslands (includes Palouse Prairie and Canyon Grasslands)
MLRA Ecoregions: 44B Central Rocky Mountain Valleys
Agrovoc Control Words: Noxious Plants Rangelands grazing
Article Review Type: Refereed
Article Type: Experimental Research
Keywords: centaurea maculosa, weed density, weed cover, weed control, clipping frequency, mechanical control, simulated grazing
Annotation: This was not a grazing study, but it did examine the effects of mowing on spotted knapweed. These results can be interpreted as potential outcomes of grazing. Apply with caution.
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