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Amitrole Residues and Rate of Dissipation in Irrigation Water

Published online by Cambridge University Press:  12 June 2017

Robert J. Demint ,
Peter A. Frank  and
Richard D. Comes
Robert J. Demint
Affiliation:
Crops Research Division, Agr. Res. Serv., U. S. Dep. of Agr., Denver, Colorado
Peter A. Frank
Affiliation:
Crops Research Division, Agr. Res. Serv., U. S. Dep. of Agr., Denver, Colorado
Richard D. Comes
Affiliation:
Crops Research Division, Agr. Res. Serv., U. S. Dep. of Agr., Irrigated Agriculture Research and Extension Center, Prosser, Washington
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Abstract

The maximum concentrations of 3-amino-s-triazole (amitrole) found in two flowing-water canals (1.13 and 0.65 cu m/sec) following treatment of a single ditchbank of each canal with 4.5 and 3.4 kg/ha of amitrole-ammonium thiocyanate (amitrole-T) were 31 and 43 ppb. Conjunctive treatment of both banks of another canal, prior to entry of water, resulted in a maximum of 98 ppb of amitrole upon turning 1.42 cu m/sec of water into the canal. Two hours after passage of the main body of amitrole-bearing water at the last sampling station on each canal, amitrole levels were down to approximately 1 ppb or less. The dissipation of amitrole in canals, for distances up to about 14.5 km, was a linear function of amitrole concentration and downstream flow. The rate of dissipation was fastest on a canal in which the herbicide was placed directly into the water (slope of 3.8), modest for a single bank treatment (slope of 2.7), and slowest where opposite banks of a canal were treated (slope of 1.8).

Type
Research Article
Information
Weed Science , Volume 18 , Issue 4 , July 1970 , pp. 439 - 442
Copyright
Copyright © 1970 Weed Science Society of America 

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References

Literature Cited

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