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Impact of Agronomic Practices on Weed Communities: Tillage Systems

Published online by Cambridge University Press:  12 June 2017

Douglas A. Derksen ,
Guy P. Lafond ,
A. Gordon Thomas ,
Heather A. Loeppky  and
Clarence J. Swanton
Douglas A. Derksen
Affiliation:
Agric. Canada, Box 760, Indian Head, SK S0G 2K0
Guy P. Lafond
Affiliation:
Agric. Canada, Box 760, Indian Head, SK S0G 2K0
A. Gordon Thomas
Affiliation:
Agric. Canada, Box 440, Regina, SK, S4P 3A2
Heather A. Loeppky
Affiliation:
Agric. Canada, Box 1240, Melfort, SK, S0E 1A0
Clarence J. Swanton
Affiliation:
Univ. Guelph, Guelph, ON N1G 2W1
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Abstract

Adverse changes in weed communities are a limiting factor for the adoption of conservation tillage practices. Predictions of an increased association of annual and perennial grasses, perennial dicot weeds, wind-disseminated species, and volunteer crops as weeds, and decreased association of annual dicot weeds in reduced-tillage systems were tested. Field experiments involving zero-, minimum-, and conventional-tillage systems were conducted in Saskatchewan from 1986 to 1990 at Ituna and Waldron, and from 1986 to 1988 at Tadmore. Weed community composition was analyzed for years 1988 to 1990 by canonical discriminant analysis. An increased association of perennial and annual grasses with zero tillage did not generally occur. Wind-dispersed species and volunteer crops were associated with reduced tillage and summer annual dicots with conventional tillage, but exceptions occurred. Species responded differently among sites or within a site over time. Within the time frame of this research, changes in weed communities were influenced more by location and year than by tillage systems, indicating fluctuational rather than directional or consistent changes in community composition.

Keywords

Zero tillageminimum tillageCirsium arvense (L.) Scop. # CIRARSonchus arvensis L. # SONARElytrigia repens (L.) Nevski # AGRRE
Type
Weed Biology and Ecology
Information
Weed Science , Volume 41 , Issue 3 , September 1993 , pp. 409 - 417
Copyright
Copyright © 1993 by the Weed Science Society of America 

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