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Persistence of 2,4-D and 2,4,5-T in Chaparral Vegetation and Soil

Published online by Cambridge University Press:  12 June 2017

S.R. Radosevich  and
W.L. Winterlin
S.R. Radosevich
Affiliation:
Dep. Bot. and Spec., Univ. of Calif., Davis, CA 95616
W.L. Winterlin
Affiliation:
Dep. Environ. Toxicol., Univ. of Calif., Davis, CA 95616
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Abstract

The persistence of 2,4-D [(2,4-dichlorophenoxy) acetic acid] and 2,4,5-T [(2,4,5-trichlorophenoxy)acetic acid] was studied in the chaparral environment. Chamise (Adenostoma fasciculatum H. & A.), grass and forbs, soil surface litter, and soil were sampled for up to 360 days after herbicide (4.5 kg/ha) application. Over 50% of the 2,4-D and 2,4,5-T recovered was found on soil surface litter while 18 to 31% was found on vegetation. Much less herbicide (0.1 to 0.2%) was found in soil (0 to 5 cm) than in foliage or litter. No herbicide residues were found below the 0 to 5 cm soil sample zone. Herbicide residues on foliage and litter decreased rapidly (up to 93%) within 30 days after application but remained constant thereafter until winter rainfall began. Residues of both herbicides were evident in chamise foliage (0.01 to 0.02%), surface litter (0.01 to 0.03%), and soil (0.01%) up to 360 days after application.

Type
Research Article
Information
Weed Science , Volume 25 , Issue 5 , September 1977 , pp. 423 - 425
Copyright
Copyright © 1977 by the Weed Science Society of America 

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