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Herbage Yield Losses in Perennial Pasture Due to Canada Thistle (Cirsium arvense)

Published online by Cambridge University Press:  20 January 2017

Chad W. Grekul  and
Edward W. Bork
Chad W. Grekul
Affiliation:
410 AgFor Center, Agricultural, Food, and Nutritional Science Department, University of Alberta, Edmonton, Alberta, Canada T6G 2P5
Edward W. Bork*
Affiliation:
410 AgFor Center, Agricultural, Food, and Nutritional Science Department, University of Alberta, Edmonton, Alberta, Canada T6G 2P5
*
Corresponding author's E-mail: edward.bork@ualberta.ca
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Abstract

Although the impact of Canada thistle (CT) on annual crop production is relatively well established, few investigations report on this weed's impact within perennial pastures. This field study assessed herbage yield losses within eight central Alberta pastures from 1999 to 2001. Each pasture was sampled in 1999 to quantify thistle and herbage biomass within 25 permanent plots. CT was controlled in 2000 and the response of vegetation measured in 2000 and 2001. Before removal, significant negative relationships (P < 0.05) between thistle abundance and herbage were noted at six sites. After thistle removal, herbage at several sites displayed positive responses. Both thistle density and biomass adequately predicted herbage yield loss. Yield losses due to CT can be substantial, peaking at 2 kg/ha for each kilogram of standing thistle biomass and 4.3 kg/ha with each additional thistle stem per square meter. Demonstrated yield losses were variable among sites however, likely due to factors such as heterogeneity in soils, available moisture, and variation in disturbance history or pasture vegetation composition. CT management in perennial pastures of western Canada may enhance pasture production, but further research is required to reliably predict the ability of pastures to respond.

Keywords

Canada thistle, Cirsium arvense (L.) Scop # CIRARForage biomasspasture heterogeneityprecipitationsward compositionweed densityCT, Canada thistleN, nitrogenOM, organic matter
Type
Research
Information
Weed Technology , Volume 18 , Issue 3 , September 2004 , pp. 784 - 794
Copyright
Copyright © Weed Science Society of America 

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