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Altitude Effects on Picloram Disappearance in Sunlight

Published online by Cambridge University Press:  12 June 2017

Thomas N. Johnsen Jr. and
Richard D. Martin
Thomas N. Johnsen Jr.
Affiliation:
U.S. Dep. Agric., Agric. Res. Serv., 2000 East Allen Road, Tucson, AZ 85719
Richard D. Martin
Affiliation:
U.S. Dep. Agric., Agric. Res. Serv., 2000 East Allen Road, Tucson, AZ 85719
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Abstract

Losses of picloram (4-amino-3,5,6-trichloropicolinic acid) in water exposed to sunlight ranged from 50 to 80% after 1 days' exposure (14 h sunlight) and 95% or more after 4 days exposure (56 h of sunlight) at four locations in Southern Arizona. Samples exposed at the highest elevation (2800 m) consistently lost picloram more quickly than samples at the lower elevations. Dry, recrystallized picloram losses were 11, 47, and 67% after 1, 2, and 4 days of sunlight exposure, respectively. At the same times, picloram losses in water were 65, 89, and 99%, respectively. These results indicate that photodecomposition is an important factor for the use and residue longevity of picloram on high-altitude rangelands of the western United States.

Keywords

Ultravioletrangelandsresiduesphotodecomposition

Information

Type
Research Article
Information
Weed Science , Volume 31 , Issue 3 , May 1983, pp. 315 - 317
Copyright
Copyright © 1983 Weed Science Society of America 

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References

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