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The Influence of Temperature, Moisture, and Prior EPTC Application on the Degradation of EPTC in Soils

Published online by Cambridge University Press:  12 June 2017

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

Laboratory and field studies were conducted to compare the degradation rate of EPTC (S-ethyl dipropylthiocarbamate) in soils with a previous history of EPTC application vs. soils with no prior EPTC application. Laboratory experiments showed a rapid breakdown of 14C-carbonyl EPTC to 14CO2 in Kennebec silt loam (sil) and Tripp very fine sandy loam (vfsl) with prior exposure to EPTC. A single prior application of EPTC to Tripp vfsl was sufficient to increase the rate of 14CO2 evolution. The rate of EPTC degradation in Tripp vfsl with a history of EPTC exposure was dependent on soil moisture from below 3% and independent of moisture above 3%. Patterns of degradation at 5, 15, and 25 C in the Kennebec sil with and without prior history were described by exponential decay. EPTC was degraded more rapidly at 15 and 25 C in the Kennebec sil with a prior EPTC history. Under field conditions the breakdown of EPTC in a Kennebec sil with and without prior exposure to EPTC was similar to laboratory results.

Keywords

Persistencethiocarbamate
Type
Research Article
Information
Weed Science , Volume 30 , Issue 2 , March 1982 , pp. 175 - 181
Copyright
Copyright © Weed Science Society of America 

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