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Loss of Herbicides in Runoff Water

Published online by Cambridge University Press:  12 June 2017

D. W. Trichell ,
H. L. Morton  and
M. G. Merkle
D. W. Trichell
Affiliation:
Plant Physiologist Crops Research Division, Agricultural Research Service, U.S. Department of Agriculture, College Station, Texas
H. L. Morton
Affiliation:
Plant Physiologist Crops Research Division, Agricultural Research Service, U.S. Department of Agriculture, College Station, Texas
M. G. Merkle
Affiliation:
Soil and Crop Science Department Texas A&M University
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Abstract

The loss of 2-methoxy-3,6-dichlorobenzoic acid (dicamba), 2,4,5-trichlorophenoxyacetic acid (2,4,5-T), and 4-amino-3,5,6-trichloropicolinic acid (picloram) in runoff water was determined with a gas chromatograph and bioassays. When determined 24 hr after application, losses of dicamba and picloram were greater from sod plots than from fallow plots while 2,4,5-T losses were about equal. Four months after application, losses of all herbicides averaged less than 1% of that lost 24 hr after application. The amount of picloram lost in a simulated rainfall of 0.5 inch varied with rate, but the percentage lost was the same. The slope of the plot and movement over untreated soil influenced the percentage of picloram lost. The maximum loss obtained for any herbicide was 5.5% and the average approximately 3%.

Type
Research Article
Information
Weed Science , Volume 16 , Issue 4 , October 1968 , pp. 447 - 449
Copyright
Copyright © Weed Science Society of America 

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References

Literature Cited

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