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The ability of 29 barley cultivars to compete and withstand competition

Published online by Cambridge University Press:  20 January 2017

Paul R. Watson ,
Douglas A. Derksen  and
Rene C. Van Acker
Douglas A. Derksen
Affiliation:
Agriculture and Agri-Food Canada, Brandon Research Centre, Box 1000A RR#3, Brandon, MB, R7A 5Y3, Canada
Rene C. Van Acker
Affiliation:
Department of Plant Science, University of Manitoba, Winnipeg, MB, R3T 2N2, Canada
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Abstract

Using competitive crops and cultivars can be an important integrated weed management (IWM) tool, useful in both conventional and low-external-input (LEI) farming systems. Barley is considered a competitive crop, but cultivar competitiveness varies. There are two aspects of cultivar competitive ability; the ability to compete (AC) and the ability to withstand competition (AWC). However, the relationship between these aspects has not been addressed in barley. A study was conducted to explore aspects of barley cultivar competitive ability with oats, and to examine the feasibility of ranking cultivars based on either, or both, AWC and AC. Field trials were undertaken in 2001 and 2002 to determine cultivar competitive ability for 29 barley cultivars commonly grown on the Canadian prairies. Cultivars were selected from semidwarf and full height, hulled and hull-less, 2- and 6-row, and feed and malt classes. Yield loss ranged from 6 to 79% while weed seed return ranged from 10 to 83% of gross yield. As a class, semidwarf and hull-less cultivars were less competitive than full height and hulled cultivars, respectively. However, considerable variation existed within these classes, and an absolute relationship between class membership and competitive ability did not exist. Ability to withstand competition was significantly correlated with ability to compete, but correlation coefficients were not strong enough to attempt reliable co-selection within a breeding program. Ability to compete was a more consistent measure of competitive ability than AWC. Ranking barley cultivar competitive ability would make it a valuable IWM tool for farmers and extension personnel.

Keywords

Barley, Hordeum vulgare L.oat, Avena sativa L. cv. AC AssiniboiaBarleycompetitive cultivarintegrated weed managementweed competition
Type
Research Article
Information
Weed Science , Volume 54 , Issue 4 , August 2006 , pp. 783 - 792
Copyright
Copyright © Weed Science Society of America 

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