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Downy Brome (Bromus tectorum) Interference in Winter Rye (Secale cereale)

Published online by Cambridge University Press:  12 June 2017

Robert E. Blackshaw
Robert E. Blackshaw*
Affiliation:
Agric. Canada Res. Stn., Lethbridge, AB, Canada T1J 4B1
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Abstract

Field experiments over 3 yr at Lethbridge, Alberta, determined the effect of various downy brome densities and times of its emergence on winter rye biomass and seed yield. Downy brome reduced yields most when it emerged within 3 wk of rye, but densities of more than 100 downy brome m-2 were required to reduce yields by 20 to 30%. The greatest reductions in rye biomass (28%) and seed (33%) yields over the 3 yr occurred when 400 downy brome m-2 emerged with the crop. Downy brome, at densities up to 400 plants m-2, emerging 6 wk after rye or in early spring, reduced rye biomass and seed yield less than 10% in all years. Winter rye effectively shaded downy brome (40 to 90%) for much of the growing season.

Keywords

Downy brome, Bromus tectorum L. # BROTEwinter rye, Secale cereale L. ‘Kodiak’Competitionphotosynthetically active radiationweed biomassrye biomassrye seedBROTE
Type
Weed Biology and Ecology
Information
Weed Science , Volume 41 , Issue 4 , December 1993 , pp. 557 - 562
Copyright
Copyright © 1994 by the Weed Science Society of America 

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