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The Persistence of 2,4,5-T in a Pacific Northwest Forest

Published online by Cambridge University Press:  12 June 2017

L. A. Norris ,
M.L. Montgomery  and
E.R. Johnson
L. A. Norris
Affiliation:
U.S. Dep. Agric. For. Serv. Pac. Northwest For. and Range Exp. Stn., Corvallis, OR 97331
M.L. Montgomery
Affiliation:
Dep. Agric. Chem., Oregon State Univ., Corvallis, OR 97331
E.R. Johnson
Affiliation:
Dep. Agric. Chem., Oregon State Univ., Corvallis, OR 97331
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Abstract

The concentrations of 2,4,5-T [(2,4,5-trichlorophenoxy)acetic acid] in four species of vegetation varied from 11 to 115 ppmw immediately after application at 2.24 kg/ha but were less than 0.5 ppmw after 1 yr. The 2,4,5-T level in forest floor declined 90% during the first 6 months after application and less than 0.02 kg/ha remained after 1 yr. There was little leaching of 2,4,5-T from the forest floor into soil and no residues were found deeper than 15 cm. Maximum soil residues did not exceed 0.1 ppmw. Residue levels and dissipation rates of 2,4,5-T were similar after one and two successive annual applications.

Type
Research Article
Information
Weed Science , Volume 25 , Issue 5 , September 1977 , pp. 417 - 422
Copyright
Copyright © 1977 by the Weed Science Society of America 

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References

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