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Competition Between Winter Wheat (Triticum aestivum) Cultivars and Downy Brome (Bromus tectorum)

Published online by Cambridge University Press:  12 June 2017

Challaiah ,
Orvin C. Burnside ,
Gail A. Wicks  and
Virgil A. Johnson
Challaiah
Affiliation:
Dep. Agron., Univ. Nebraska, Lincoln, NE 68583
Orvin C. Burnside
Affiliation:
Dep. Agron. and Plant Genetics, Univ. Minnesota, St. Paul, MN 55108
Gail A. Wicks
Affiliation:
Dep. Agron., West Central Res. and Ext. Center, North Platte, NE 69101
Virgil A. Johnson
Affiliation:
U.S. Dep. Agric., Agric. Res. Serv., Lincoln, NE 68583
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Abstract

Field experiments were conducted to select winter wheat (Triticum aestivum L.) cultivar(s) that were competitive to downy brome (Bromus tectorum L. # BROTE). Downy brome significantly reduced winter wheat grain yields of all cultivars by 9 to 21% at Lincoln, while at North Platte yield reduction ranged from 20 to 41% depending upon cultivar. ‘Turkey’ was the most competitive cultivar to downy brome but it had the lowest grain yield. Compared to ‘Centurk 78’, ‘Centura’ at Lincoln and ‘SD 75284’ at North Platte proved to be significantly higher yielding and more competitive to downy brome. Winter wheat tiller number, canopy diameter, and plant height were negatively correlated with downy brome yield, but changes in these growth parameters did not always translate into grain yield advantage in downy brome-infested plots. Based on stepwise regression analysis, wheat height was better correlated with reduction in downy brome yield than were canopy diameter or number of tillers.

Keywords

Allelopathycanopy coverinterferenceweed suppressionBROTE
Type
Weed Biology and Ecology
Information
Weed Science , Volume 34 , Issue 5 , September 1986 , pp. 689 - 693
Copyright
Copyright © 1986 by the Weed Science Society of America 

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