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Integrating Cropping Systems with Cultural Techniques Augments Wild Oat (Avena fatua) Management in Barley

  • K. Neil Harker (a1), John T. O'Donovan (a1), R. Byron Irvine (a2), T. Kelly Turkington (a1) and George W. Clayton (a3)...

Wild oat causes more crop yield losses and accounts for more herbicide expenditures than any other weed species on the Canadian Prairies. A study was conducted from 2001 to 2005 at four Canadian Prairie locations to determine the influence of repeated cultural and herbicidal management practices on wild oat population density, biomass, and seed production, and on barley biomass and seed yield. Short or tall cultivars of barley were combined with normal or double barley seeding rates in continuous barley or a barley–canola–barley–field-pea rotation under three herbicide rate regimes. The same herbicide rate regime was applied to the same plots in all crops each year. In barley, cultivar type and seeding rate were also repeated on the same plots year after year. Optimal cultural practices (tall cultivars, double seeding rates, and crop rotation) reduced wild oat emergence, biomass, and seed production, and increased barley biomass and seed yield, especially at low herbicide rates. Wild oat seed production at the quarter herbicide rate was reduced by 91, 95, and 97% in 2001, 2003, and 2005, respectively, when tall barley cultivars at double seeding rates were rotated with canola and field pea (high management) compared to short barley cultivars at normal seeding rates continuously planted to barley (low management). Combinations of favorable cultural practices interacted synergistically to reduce wild oat emergence, biomass and seed production, and to increase barley yield. For example, at the quarter herbicide rate, wild oat biomass was reduced 2- to 3-, 6- to 7-, or 19-fold when optimal single, double, or triple treatments were combined, respectively. Barley yield reductions in the low-management scenario were somewhat compensated for by full herbicide rates. However, high management at low herbicide rates often produced more barley than low management in higher herbicide rate regimes.

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R. L. Anderson 2003. An ecological approach to strengthen weed management in the semiarid Great Plains. Adv. Agron. 80:3362.

R. L. Anderson 2005. A multi-tactic approach to manage weed population dynamics in crop rotations. Agron. J. 97:15791583.

H. J. Beckie , J. Y. Leeson , A. G. Thomas , C. A. Brenzil , L. M. Hall , G. Holzgang , C. Lozinski , and S. Shirriff 2008. Weed resistance monitoring in the Canadian Prairies. Weed Technol. 22:530543.

R. E. Blackshaw , K. N. Harker , J. T. O'Donovan , H. J. Beckie , and E. G. Smith 2008. Ongoing development of integrated weed management systems on the Canadian Prairies. Weed Sci. 56:146150.

E. Donmez , R. G. Sears , J. P. Shroyer , and G. M. Paulsen 2001. Genetic gain in yield attributes of winter wheat in the Great Plains. Crop Sci. 41:14121419.

K. N. Harker , G. W. Clayton , R. E. Blackshaw , J. T. O'Donovan , and F. C. Stevenson 2003a. Seeding rate, herbicide timing and competitive hybrids contribute to integrated weed management in canola (Brassica napus). Can. J. Plant Sci. 83:433440.

C. L. Mohler 2001. Weed life history: identifying vulnerabilities. Pages 4098. In M. Liebman , C. L. Mohler , and C. P. Staver Ecological Management of Agricultural Weeds. Cambridge, UK Cambridge University Press.

J. R. Moyer , E. S. Romain , C. W. Lindwall , and R. E. Blackshaw 1994. Weed management in conservation tillage systems for wheat production in North and South America. Crop Prot. 13:243259.

J. T. O'Donovan , R. E. Blackshaw , K. N. Harker , and G. W. Clayton 2006. Wheat seeding rate influences herbicide performance in wild oat (Avena fatua L.). Agron. J. 98:815822.

J. T. O'Donovan , J. C. Newman , K. N. Harker , R. E. Blackshaw , and D. W. McAndrew 1999. Effect of barley plant density on wild oat interference, shoot biomass and seed yield under zero tillage. Can. J. Plant Sci. 79:655662.

D. C. Thill , J. T. O'Donovan , and C. A. Mallory-Smith 1994. Integrated weed management strategies for delaying herbicide resistance. Phytoprotection. 75 (Suppl):6170.

T. K. Turkington , K. Xi , J. P. Tewari , H. K. Lee , G. W. Clayton , and K. N. Harker 2005. Cultivar rotation as a strategy to reduce leaf diseases under barley monoculture. Can. J. Plant Pathol. 27:283290.

E. Zand and H. J. Beckie 2002. Competitive ability of hybrid and open-pollinated canola (Brassica napus) with wild oat (Avena fatua). Can. J. Plant Sci. 82:473480.

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Weed Science
  • ISSN: 0043-1745
  • EISSN: 1550-2759
  • URL: /core/journals/weed-science
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