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Volunteer Barley Interference in Spring Wheat Grown in a Zero-Tillage System

Published online by Cambridge University Press:  20 January 2017

John T. O'Donovan ,
K. Neil Harker ,
George W. Clayton ,
Linda M. Hall ,
Jason Cathcart ,
Kenneth L. Sapsford ,
F. A. Holm  and
Kristin Hacault
John T. O'Donovan*
Affiliation:
Agriculture and Agri-Food Canada, 6000 C & E Trail, Lacombe, AB, Canada T4L 1W1
K. Neil Harker
Affiliation:
Agriculture and Agri-Food Canada, 6000 C & E Trail, Lacombe, AB, Canada T4L 1W1
George W. Clayton
Affiliation:
Agriculture and Agri-Food Canada, 6000 C & E Trail, Lacombe, AB, Canada T4L 1W1
Linda M. Hall
Affiliation:
Department of Agriculture, Food and Nutritional Science, University of Alberta, Edmonton, AB, Canada T6G 2E1
Jason Cathcart
Affiliation:
Department of Agriculture, Food and Nutritional Science, University of Alberta, Edmonton, AB, Canada T6G 2E1
Kenneth L. Sapsford
Affiliation:
Crop Development Centre, University of Saskatchewan, 51 Campus Drive, Saskatoon, SK, Canada S7N 5A8
F. A. Holm
Affiliation:
Crop Development Centre, University of Saskatchewan, 51 Campus Drive, Saskatoon, SK, Canada S7N 5A8
Kristin Hacault
Affiliation:
BASF Canada, 132, 9650 20th Avenue, Edmonton, AB, Canada T6N 1N1
*
Corresponding author's E-mail: odonovanj@agr.gc.ca.
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Abstract

There is no published information on the impact of volunteer barley on wheat yield loss or on the economics of controlling barley with a herbicide. With the registration of imazamox-resistant wheat, it is now possible to control volunteer barley in wheat. Thus, the likelihood of growing wheat in rotation with barley may increase. Field experiments were conducted in 2003 and 2004 at Beaverlodge, Lacombe, and Edmonton, AB, Canada, and Saskatoon, SK, Canada, to determine the impact of volunteer barley on yield of imazamox-resistant spring wheat seeded at relatively low (100 kg ha−1) and high (175 kg ha−1) rates. Barley was seeded at different densities to simulate volunteer barley infestations. Regression analysis indicated that wheat-plant density influenced the effects of volunteer barley interference on wheat yield loss, economic threshold values, and volunteer barley fecundity among locations and years. Economic thresholds varied from as few volunteer barley plants as 3 m−2 at Beaverlodge in 2003 and 2004 to 48 m−2 at Lacombe in 2003. In most cases, wheat yield loss and volunteer barley fecundity were lower and economic thresholds were higher when wheat was seeded at the higher rate. For example, averaged over both years at Beaverlodge initial slope values (percentage of wheat yield loss at low barley density) were 4.5 and 1.7%, and economic threshold values of volunteer barley plants were 3 m−2 and 8 m−2 at low and high wheat seeding rates, respectively. Results indicate that volunteer barley can be highly competitive in wheat, but yield losses and wheat seed contamination due to volunteer barley can be alleviated by seeding wheat at a relatively high rate.

Keywords

Barley, Hordeum vulgare L. ‘AC Lacombe’wheat, Triticum aestivum L. ‘CDC Imagine’Admixtureeconomic thresholdimazamox-resistant wheatvolunteer barley fecunditywheat seeding ratewheat yield loss
Type
Research Article
Information
Weed Science , Volume 55 , Issue 1 , February 2007 , pp. 70 - 74
Copyright
Copyright © Weed Science Society of America 

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