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An Integrated Weed Management Approach to Managing Foxtail Barley (Hordeum jubatum) in Conservation Tillage Systems

Published online by Cambridge University Press:  12 June 2017

Robert E. Blackshaw ,
Greg Semach ,
Xiangju Li ,
John T. O'Donovan  and
K. Neil Harker
Robert E. Blackshaw*
Affiliation:
Research Center, Agriculture and Agri-Food Canada, P.O. Box 3000, Lethbridge, AB. Canada T1J 4B1
Greg Semach
Affiliation:
Research Center, Agriculture and Agri-Food Canada, P.O. Box 3000, Lethbridge, AB. Canada T1J 4B1
Xiangju Li
Affiliation:
Institute of Food and Oil Crops, Hebei Academy of Agricultural and Forestry Sciences, Shijiazhuang, Hebei 050031 China
John T. O'Donovan
Affiliation:
Alberta Research Council, Bag 4000, Vegreville, AB, Canada T0B 4L0
K. Neil Harker
Affiliation:
Research Center, Agriculture and Agri-Food Canada, 6000 C and E Trail, Lacombe, AB, Canada T4L 1W1
*
Corresponding author's E-mail: blackshaw@em.agr.ca.
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Abstract

A 4-yr field experiment was conducted to determine the merits of combining cultural and chemical controls to manage foxtail barley in reduced-tillage systems. Factors studied were crop row spacing, seeding rate, and application rate and timing of glyphosate within a spring wheat-flax cropping sequence. Glyphosate applied preseeding at 400 or 800 g/ha killed foxtail barley seedlings but only suppressed established perennial plants. Glyphosate applied postharvest at 800 g/ha killed 60 to 70% of established plants. Combinations of preseeding and postharvest glyphosate gave the greatest reductions in foxtail barley biomass and seed production and resulted in the greatest increases in crop yield. Including flax in the rotation allowed use of grass herbicides such as quizalofop or sethoxydim that effectively controlled foxtail barley seedlings and provided some suppression of perennial plants. An increase in wheat seeding rate from 75 to 115 kg/ha reduced foxtail barley growth and increased wheat yield in 3 of 4 yr. Increasing the flax seeding rate from 40 to 80 kg/ha or reducing wheat and flax row spacing from 30 to 20 cm provided little benefit in managing foxtail barley or increasing crop yield. A multiyear approach combining agronomic practices and timely use of herbicides should allow growers to effectively manage foxtail barley in annual cropping systems using conservation tillage.

Keywords

Glyphosate, N-(phosphonomethyl)glycinequizalofop, (±)-2-[4-[(6-chloro-2-quinoxalinyl)oxy]phenoxy]propanoic acidsethoxydim, 2-[1-(ethoxyimino)butyl]-5-[2-(ethylthio)propyl]-3-hydroxy-2-cyclohexen-1-onefoxtail barley, Hordeum jubatum L. #HORJUflax, Linum usitatissimum L. ‘Flanders’wheat, Triticum aestivum L. ‘Katepwa.’Crop rotationcultural weed controlglyphosaterow spacingseeding ratezero-tillageHORJUPAR, photosynthetically active radiation
Type
Research
Information
Weed Technology , Volume 13 , Issue 2 , June 1999 , pp. 347 - 353
Copyright
Copyright © 1999 by the Weed Science Society of America 

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Footnotes

1

Lethbridge Research Center contribution 3879854.

References

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