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The Effects of Increasing Grazing Height on Establishment of Pasture Weeds in Management-Intensive Rotationally Grazed Pastures

Published online by Cambridge University Press:  20 January 2017

Mark J. Renz  and
Marie L. Schmidt
Mark J. Renz*
Affiliation:
Agronomy Department, University of Wisconsin Madison, 1575 Linden Drive, Madison WI 53706
Marie L. Schmidt
Affiliation:
Agronomy Department, University of Wisconsin Madison, 1575 Linden Drive, Madison WI 53706
*
Corresponding author's E-mail: [email protected]
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Abstract

Weeds can infest management-intensive grazed pastures and impact forage quantity, forage quality, and animal health. Common burdock, plumeless thistle, and Canada thistle are three common pasture weeds in the midwestern United States that are managed to avoid these impacts. Experiments were established at two sites to determine if increasing grazing heights from fall through summer would reduce emergence and survival of burdock, plumeless thistle, and Canada thistle seedlings. Five simulated grazing heights (5, 10, 15, and 20 cm and a not-clipped treatment) were implemented in October 2008 and repeated in May through August. Density of all species was reduced from May to September, with reductions ranging from 65 to 78%, regardless of treatment. Treatments that left at least 15 cm of residual grass had reduced densities of burdock and Canada thistle compared to the 10-cm treatment. Regression analysis demonstrated that reduction in burdock and summed planted weed density was related to increased intercepted photosynthetically active radiation from forage in April. However, total biomass yield was reduced up to 60% when grazing heights were increased from 5 to 20 cm, although differences were only observed at the fall and early spring grazing events. Relative forage quality (RFQ) was similar across treatments, except at the third grazing event for which the 15 and 20-cm treatments had reduced RFQ compared with other treatments. Results suggest that increasing grazing heights can reduce emergence and survival of burdock and Canada thistle but can also result in a reduction in forage quantity in the fall and early spring.

Keywords

Canada thistle, Cirsium arvense (L.) Scopcommon burdock, Arctium minus Bernhplumeless thistle, Carduus acanthoides LLight interceptionweed emergenceweed survival
Type
Weed Management
Information
Weed Science , Volume 60 , Issue 1 , March 2012 , pp. 92 - 96
Copyright
Copyright © Weed Science Society of America 

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