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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 ,
Francis O. Larney ,
C. Wayne Lindwall  and
Gerald C. Kozub
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
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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.

Keywords

trifluralin, 2,6-dinitro-N,N-dipropyl-4-(trifluoromethyl)benzenaminecommon lambsquarters, Chenopodium album L. # CHEALdandelion, Taraxacum officinale Weber in Wiggers # TAROFdowny brome, Bromus tectorum L. # BROTEfield pennycress, Thlaspi arvense L. # THLARflixweed, Descurainia sophia (L.) Webb. ex Prantl # DESSOperennial sowthistle, Sonchus arvensis L. # SONARredroot pigweed, Amaranthus retroflexus L. # AMARERussian thistle, Salsola iberica Sennen & Pau # SASKRwild buckwheat, Polygonum convolvulus L. # POLCOcanola, Brassica campestris L. ‘Tobin’lentil, Lens culinaris L. ‘Laird’winter wheat, Triticum aestivum L. ‘Norstar.’Conservation tillagefallowweed densitiesLinum usitatissimumAMAREBROTECHEALDESSOKCHSCPOLCOSASKRSONARTHLAR
Type
Research
Information
Weed Technology , Volume 8 , Issue 2 , June 1994 , pp. 231 - 237
Copyright
Copyright © 1994 by the Weed Science Society of America 

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