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A Comparison of Symmetrical and Asymmetrical Triazine Herbicides for Enhanced Degradation in Three Midwestern Soils

Published online by Cambridge University Press:  11 September 2018

Ethan T. Parker ,
Micheal D. K. Owen ,
Mark L. Bernards ,
William S. Curran ,
Lawrence E. Steckel  and
Thomas C. Mueller
Ethan T. Parker
Affiliation:
Research and Development Scientist, Syngenta Crop Protection, Vero Beach, FL, USA
Micheal D. K. Owen
Affiliation:
University Professor Emeritus, Agronomy Department, Iowa State University, Ames, IA, USA
Mark L. Bernards
Affiliation:
Associate Professor, School of Agriculture, Western Illinois University, Macomb, IL, USA
William S. Curran
Affiliation:
Professor, Department of Plant Science, Penn State University, University Park, PA, USA
Lawrence E. Steckel
Affiliation:
Professor, Department of Plant Sciences, University of Tennessee, West TN AgResearch and Education Center, Jackson, TN, USA
Thomas C. Mueller*
Affiliation:
Professor, Department of Plant Sciences, University of Tennessee, Knoxville, TN, USA
*
*Author for correspondence: Thomas C. Mueller, 2431 Joe Johnson Drive, Knoxville, TN 37996. (Email: tmueller@utk.edu)
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Abstract

The triazines are one of the most widely used herbicide classes ever developed and are critical for managing weed populations that have developed herbicide resistance. These herbicides are traditionally valued for their residual weed control in more than 50 crops. Scientific literature suggests that atrazine, and perhaps other s-triazines, may no longer remain persistent in soils due to enhanced microbial degradation. Experiments examined the rate of degradation of atrazine and two other triazine herbicides, simazine and metribuzin, in both atrazine-adapted and non-history Corn Belt soils, with similar soils being used from each state as a comparison of potential triazine degradation. In three soils with no history of atrazine use, the t1/2 of atrazine was at least four times greater than in three soils with a history of atrazine use. Simazine degradation in the same three sets of soils was 2.4 to 15 times more rapid in history soils than non-history soils. Metribuzin in history soils degraded at 0.6, 0.9, and 1.9 times the rate seen in the same three non-history soils. These results indicate enhanced degradation of the symmetrical triazine simazine, but not of the asymmetrical triazine metribuzin.

Keywords

Sharon Clay, South Dakota State UniversityAtrazinecarryoverenhanced degradationenvironmental fatemetribuzinmicrobial activitysimazines-triazine.
Type
Soil, Air, and Water
Information
Weed Science , Volume 66 , Issue 5 , September 2018 , pp. 673 - 679
Copyright
© Weed Science Society of America, 2018 

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