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Five Cool-Season Annual Grass Weeds Reduce Hard Red Winter Wheat Grain Yield and Price

Published online by Cambridge University Press:  20 January 2017

Brandon J. Fast ,
Case R. Medlin  and
Don S. Murray
Brandon J. Fast
Affiliation:
Plant and Soil Sciences Department, Oklahoma State University, 368 Agricultural Hall, Stillwater, OK 74078
Case R. Medlin
Affiliation:
Plant and Soil Sciences Department, Oklahoma State University, 368 Agricultural Hall, Stillwater, OK 74078
Don S. Murray*
Affiliation:
Plant and Soil Sciences Department, Oklahoma State University, 368 Agricultural Hall, Stillwater, OK 74078
*
Corresponding author's E-mail: [email protected].
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Abstract

Field experiments were conducted in Oklahoma to quantify the wheat grain yield losses and price discounts resulting from season-long interference with cheat, feral rye, Italian ryegrass, jointed goatgrass, and wild oat. Plots were seeded to individual weeds at one of seven seeding rates, and wheat was planted in all plots at a uniform rate. Maximum weed densities were 89 (cheat), 80 (feral rye), 158 (Italian ryegrass), 170 (jointed goatgrass), and 120 plants/m2 (wild oat). Wheat grain yield losses caused by interference from the maximum density of each weed species were 19 (cheat), 55 (feral rye), 20 (Italian ryegrass), 21 (jointed goatgrass), and 28% (wild oat). Wheat grain total price discounts caused by interference from the maximum density of each weed species were 22 (cheat), 368 (feral rye), 26 (Italian ryegrass), 36 (jointed goatgrass), and 64 cents/hectoliter (wild oat). Of the five weed species included in this research, interference from feral rye had the greatest effect on wheat grain yield and price.

Keywords

Cheat, Bromus secalinus L. BROSEferal rye, Secale cereale L. SECCEItalian ryegrass, Lolium perenne L. ssp. multiflorum (Lam.) Husnot LOLMUjointed goatgrass, Aegilops cylindrica Host AEGCYwild oat, Avena fatua L. AVEFAwheat, Triticum aestivum L. ‘Jagger’Dockageforeign materialgrain gradeshrunken and broken kernelsweed competitionweed densityweed interferencewheat grain price discountwheat grain qualitywheat yield loss
Type
Weed Management—Major Crops
Information
Weed Technology , Volume 23 , Issue 2 , June 2009 , pp. 206 - 213
Copyright
Copyright © Weed Science Society of America 

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