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Effects of Quinclorac on Following Rotational Crops

Published online by Cambridge University Press:  12 June 2017

James R. Moyer ,
Rudy Esau  and
A. Lyle Boswall
James R. Moyer
Affiliation:
Agriculture and Agri-Food Canada Research Centre, Lethbridge, AB, Canada T1J 4B1
Rudy Esau
Affiliation:
Crop Diversification Centre, South, Brooks, AB, Canada T1R 1E6
A. Lyle Boswall
Affiliation:
Agriculture and Agri-Food Canada Research Centre, Lethbridge, AB, Canada T1J 4B1
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Abstract

Quinclorac was registered for weed control in wheat (Triticum spp.) for western Canada in 1997. Residues from quinclorac may persist in the soil and may damage following crops; therefore, field and growth chamber experiments were conducted to determine the tolerance of several following rotational crops. Cereals and bromegrass (Bromus biebersteinii) were sufficiently tolerant that they could be seeded within 16 d of quinclorac application without risk of injury. At the other extreme, marketable and total potato (Solanum tuberosum) yields were reduced by quinclorac on irrigated land 1 yr after application. Growth chamber experiments were used to rank crops in order of their tolerance of quinclorac residues and to compare the tolerance of crops that were grown in the field with additional crops. Quinclorac injured several legume and oilseed crops when the crops were seeded immediately after application, but quinclorac did not reduce the dry matter yield of two of the most sensitive legumes, faba bean (Vicia faba) and alfalfa (Medicago sativa), 1 yr after application on irrigated land. However, based on a previous study, one can conclude that injury to these crops may occur in the field under drought conditions in rain-fed agricultural systems.

Keywords

Quinclorac, 3,7-dichloro-8-quinolinecarboxylic acidalfalfa, Medicago sativa L.faba bean, Vicia faba L.meadow bromegrass, Bromus biebersteinii Roem and Schultpotato, Solanum tuberosum L.Crop injurycrop rotationpotatopersistencesoil moistureDAP, days after plantingGR50, quinclorac rate causing an injury rating of 50

Information

Type
Research
Information
Weed Technology , Volume 13 , Issue 3 , September 1999 , pp. 548 - 553
Copyright
Copyright © 1999 by the Weed Science Society of America 

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Footnotes

1

Contribution 3879869 of the Lethbridge Research Centre, Lethbridge, AB, Canada T1J 4B1.

For the Department of Agriculture and Agri-Food, Government of Canada © Minister of Public Works and Government Services Canada 1999

References

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