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Duration of Enhanced Soil Degradation of EPTC as Influenced by Herbicide Rotation, Time, and Location

Published online by Cambridge University Press:  12 June 2017

Brent W. Bean ,
Fred W. Roeth ,
Alex R. Martin  and
Robert G. Wilson
Brent W. Bean
Affiliation:
Dep. Agron., Univ. Nebraska, Lincoln, 68583
Fred W. Roeth
Affiliation:
South Central Res. and Ext. Ctr., Clay Center, 68933
Alex R. Martin
Affiliation:
Dep. Agron., Lincoln, 68583
Robert G. Wilson
Affiliation:
Panhandle Res. and Ext. Ctr., Scottsbluff
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Abstract

Soils did not remain enhanced for EPTC degradation when EPTC was applied in a biennial rotation with cyanazine, cycloate, or alachlor as indicated by laboratory analysis and early-season weed control in the year of EPTC use. Control of late-season weeds was less when EPTC was rotated with alachlor than with a first-time use of EPTC. EPTC degradation remained enhanced in an EPTC-butylate rotation. The reversion rate of soil from an enhanced condition to normality was gradual and varied with location, year, and number of prior EPTC applications. At Clay Center and Scottsbluff, soils reverted to a nonenhanced EPTC degradation rate 18 months after initial EPTC application. At Scottsbluff, soil was not enhanced for EPTC degradation 18 months after the second of two annual EPTC applications. Soil from Clay Center was partially enhanced for EPTC degradation 18 months after the second of two annual EPTC applications but was not enhanced after 30 months.

Keywords

EPTC, S-ethyl dipropyl carbamothiatecyanazine, 2-[[4-chloro-6-(ethylamino)-1,3,5-triazin-2-yl] amino]-2-methylpropanenitrilecycloate, S-ethyl cyclohexylethylcarbamothioatealachlor, 2-chloro-N-(2,6-diethylphenyl)-N-(methoxymethyl)acetamidebutylate, S-ethylbis (2-methylpropyl)carbamothioateAccelerated degradationcarbamothioateherbicide enhancement
Type
Soil, Air, and Water
Information
Weed Science , Volume 36 , Issue 4 , July 1988 , pp. 524 - 530
Copyright
Copyright © 1988 by the Weed Science Society of America 

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References

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