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Crop Rotation and Tillage Effects on Weed Populations on the Semi-Arid Canadian Prairies

Published online by Cambridge University Press:  12 June 2017

Robert E. Blackshaw
Affiliation:
Agric. Canada Res. Stn., Lethbridge, AB, Canada T1J 4B1
Francis O. Larney
Affiliation:
Agric. Canada Res. Stn., Lethbridge, AB, Canada T1J 4B1
C. Wayne Lindwall
Affiliation:
Agric. Canada Res. Stn., Lethbridge, AB, Canada T1J 4B1
Gerald C. Kozub
Affiliation:
Agric. Canada Res. Stn., Lethbridge, AB, Canada T1J 4B1

Abstract

A long-term study was conducted at Lethbridge, Alberta, to determine the response of weed populations to various crop rotations and tillage treatments. Weed density and species composition differed with rotation, tillage, and date of sampling within years. Fewer weeds were found in winter wheat-fallow than continuous winter wheat, winter wheat-lentil, or winter wheat-canola rotations. A dense infestation of downy brome developed in the continuous winter wheat rotation. In all rotations, more weeds were present in zero tillage plots than in either minimum or conventional tillage plots. Dandelion and perennial sowthistle densities increased slightly over years in the minimum and zero tillage treatments. Flixweed, field pennycress, wild buckwheat, and common lambsquarters densities decreased in zero till but densities of downy brome, redroot pigweed, and Russian thistle increased. Russian thistle was not well controlled with trifluralin and its density increased in the winter wheat-canola rotation.

Type
Research
Copyright
Copyright © 1994 by the Weed Science Society of America 

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