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Comparative Persistence and Mobility of Pyridine and Phenoxy Herbicides in Soil

Published online by Cambridge University Press:  12 June 2017

James R. Jotcham ,
David W. Smith  and
Gerald R. Stephenson
James R. Jotcham
Affiliation:
Balsam Res., Box 900, Berwick, Nova Scotia, Canada BOP 1EO
David W. Smith
Affiliation:
Dep. Bot., Univ. Guelph, Guelph, Ontario, Canada N1G 2W1
Gerald R. Stephenson
Affiliation:
Dep. Environ. Biol., Univ. Guelph, Guelph, Ontario, Canada N1G 2W1
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Abstract

Bioassays with soybeans and lentils were used to compare the persistence of 2,4,5-T, triclopyr, and picloram in soil after applying 0.038, 0.38, and 3.8 kg ae/ha under field conditions. Soil samples were collected from 1 to 269 days after spraying and were kept frozen until growth room bioassays were conducted. Triclopyr was slightly less persistent than 2,4,5-T, but neither herbicide was biologically active during the next season. At least 90% of picloram disappeared within 7 months, but its biological activity was more persistent than that of either triclopyr or 2,4,5-T. Nine months after treatment, neither lentils nor soybeans could be grown in soil treated with picloram at 3.8 kg/ka. Triclopyr and 2,4-D had smiilar soil thin layer chromatographic mobilities in four different scils. Picloram was significantly more mobile than either triclopyr or 2,4,5-T, primarily due to its lower adsorption in the soils examined.

Keywords

2,4-D, (2,4-dichlorophenoxy)acetic acidpicloram, 4-amino-3,4,6-trichloro-2-pyridinecarboxylic acid2,4,5-T, (2,4,5-trichlorophenoxy)acetic acidtriclopyr, [(3,5,6-trichloro-2-pyridinyl)oxy]acetic acidsoybeans, Glycine max (L.)Merr. ‘Evans’lentils, Lens culinaris Medik. ‘Laird’Bioassaysoil thin-layer chromatographypicloramtriclopyr
Type
Research
Information
Weed Technology , Volume 3 , Issue 1 , March 1989 , pp. 155 - 161
Copyright
Copyright © 1989 by the Weed Science Society of America 

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References

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