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Chlorsulfuron Persistence and Response of Nine Rotational Crops in Alkaline Soils of Southern Alberta

Published online by Cambridge University Press:  12 June 2017

James R. Moyer ,
Rudy Esau  and
Gerald C. Kozub
James R. Moyer
Affiliation:
Agric. Canada Res. Stn., Lethbridge, AB T1J 4B1, Canada
Rudy Esau
Affiliation:
Agric. Canada Res. Stn., Lethbridge, AB T1J 4B1, Canada
Gerald C. Kozub
Affiliation:
Alta. Hortic. Res. Cent., Brooks, AB T0J 0J0, Canada
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Abstract

Chlorsulfuron was applied to wheat at rates of 0, 10, 20, and 40 g ai ha-1 in three locations at Lethbridge and Brooks between 1980 and 1984. The soil pH and organic matter contents at Lethbridge and Brooks were 8.0 and 2.1% and 7.4 and 3.0%, respectively. Rotational crops were seeded for up to 7 yr after chlorsulfuron application. The criteria used to indicate when susceptible crops will grow safely were no significant yield loss at the 40 g ha-1 rate and the magnitude of the upper confidence limit for this difference. The following times after application before crop yields were not affected were required at Lethbridge: barley, 2 yr; canola, 3 yr; peas, beans, 4 yr; flax and potatoes, 5 yr; alfalfa and sugarbeets, 6 yr; and lentils at least 7 yr. The effect of chlorsulfuron residues in the soil on rotational crops appeared to be similar at Brooks and at Lethbridge. Estimated chlorsulfuron concentrations were related to the tolerance of rotational crops.

Keywords

Chlorsulfuron, 2-chloro-N-[[(4-methoxy-6-methyl-1,3,5-triazin-2-yl)amino]-carbonyl]benzenesulfonamidealfalfa, Medicago sativa L.barley, Hordeum vulgare L.bean, Phaseolus vulgaris L.canola, Brassica napus L.flax, Linum usitatissimum L.lentil, Lens culinaris Medikpea, Pisum sativum L.potato, Solanum tuberosum L.sugarbeet, Beta vulgaris L.wheat, Triticum aestivum L.Replantresiduesoil pH
Type
Research
Information
Weed Technology , Volume 4 , Issue 3 , September 1990 , pp. 543 - 548
Copyright
Copyright © 1990 Weed Science Society of America 

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References

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