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Grazing intensity effects on weed populations in annual and perennial pasture systems

Published online by Cambridge University Press:  20 January 2017

K. Neil Harker ,
Vern S. Baron ,
David S. Chanasyk ,
M. Anne Naeth  and
F. Craig Stevenson
Vern S. Baron
Affiliation:
Agriculture and Agri-Food Canada, Lacombe Research Centre, 6000 C & E Trail, Lacombe, AB, Canada T4L 1W1
David S. Chanasyk
Affiliation:
Renewable Resources Department, University of Alberta, Edmonton, AB, Canada T6G 2P5
M. Anne Naeth
Affiliation:
Renewable Resources Department, University of Alberta, Edmonton, AB, Canada T6G 2P5
F. Craig Stevenson
Affiliation:
206A Dunlop Street, Saskatoon, SK, Canada S7N 2B7
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Abstract

Few studies report animal grazing effects on weed populations. A study was conducted to assess weed populations in annual and perennial forage grasses grazed at various intensities by cattle over a 4-yr period. The perennial forages were Bromus inermis and Bromus riparius, and the annual forages were winter Triticosecale and a mixture of Hordeum vulgare and winter Triticosecale. With few exceptions, results from the two annual pastures could be adequately described as a group, as could the results from the two perennial pastures. The two most prevalent weed species were Capsella bursa-pastoris and Taraxacum officinale; other species encountered over the course of the study were analyzed as a group. Tillage (seedbed preparation) in the annual system supported a proliferation of annual weeds in the spring. In the perennial pasture system, a lack of tillage and spring MCPA allowed T. officinale to increase as the study progressed, especially at the highest grazing intensity. In the perennial pastures, each unit increase in grazing intensity led to 51 more C. bursa-pastoris m−2 and 4 more T. officinale m−2. At lower levels of grazing intensity, C. bursa-pastoris and other species were most abundant in the annual pastures. Weed population shifts in response to grazing pressure in the annual pasture systems were restricted because of annual tillage and MCPA. Therefore, pasture managers may subject annual pastures to heavy grazing pressure with less negative weed population consequences than perennial pastures where herbicides are not applied.

Keywords

MCPACapsella bursa-pastoris (L.) Medik. CAPBP, shepherdspurseTaraxacum officinale Weber in Wiggers TAROF, dandelionBromus inermis Leyss. ‘Carlton’, smooth bromegrassBromus riparius Rhem. ‘Paddock’, meadow bromegrassHordeum vulgare L. ‘AC Lacombe’, barley× Triticosecale Wittm. ‘Pika’, winter triticaleCropping systemdiversityselection pressureCAPBPTAROF
Type
Research Article
Information
Weed Science , Volume 48 , Issue 2 , April 2000 , pp. 231 - 238
Copyright
Copyright © Weed Science Society of America 

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