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Butylate Persistence and Activity in Soils Previously Treated with Thiocarbamates

Published online by Cambridge University Press:  12 June 2017

Gary L. Tuxhorn ,
Fred W. Roeth ,
Alex R. Martin  and
Robert G. Wilson
Gary L. Tuxhorn
Affiliation:
Dep. Agron., Univ. Nebraska, Clay Center 68933
Fred W. Roeth
Affiliation:
Dep. Agron., Univ. Nebraska, Lincoln 68583
Alex R. Martin
Affiliation:
Dep. Agron., Univ. Nebraska, Lincoln 68583
Robert G. Wilson
Affiliation:
Dep. Agron., Univ. Nebraska, Scottsbluff, NE 69361
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Abstract

Butylate [S-ethyl bis(2-methylpropyl)carbamothioate] persistence was compared in three soils that were treated annually with four thiocarbamate herbicides in 1981 and 1982. Butylate degraded faster in soils treated two consecutive years with butylate + dichlormid (2,2-dichloro-N,N-di-2-prophenylacetamide) than in soils treated for 2 yr with EPTC (S-ethyl dipropyl carbamothioate) + dichlormid, cycloate (S-ethyl cyclohexylethylcarbamothioate), vernolate (S-propyl dipropylcarbamothioate) + dichlormid, or from previously untreated soils. Butylate + dichlormid applications in 1981 and 1982 enhanced butylate degradation in 1983 at all locations and reduced weed control at two locations. Previously untreated soil or soil previously treated with two annual applications of butylate + dichlormid was treated with 6 ppmw butylate, incubated for 14 days, analyzed for residual butylate, and bioassayed for herbicide activity. Bioassay indicated higher herbicidal activity than was predicted by the residual butylate concentration. A herbicidally active metabolite may be produced during the soil degradation of butylate.

Keywords

Herbicide enhancementaccelerated degradationmetaboliteweed controlEPTC
Type
Soil, Air, and Water
Information
Weed Science , Volume 34 , Issue 6 , November 1986 , pp. 961 - 965
Copyright
Copyright © 1986 by the Weed Science Society of America 

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References

Literature Cited

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