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Effect of Soil pH and Previous Atrazine Use History on Atrazine Degradation in a Tennessee Field Soil

Published online by Cambridge University Press:  20 January 2017

Thomas C. Mueller ,
Lawrence E. Steckel  and
Mark Radosevich
Thomas C. Mueller*
Affiliation:
Department of Plant Sciences, The University of Tennessee, Knoxville, TN 37996
Lawrence E. Steckel
Affiliation:
Department of Plant Sciences, The University of Tennessee, Knoxville, TN 37996
Mark Radosevich
Affiliation:
Department of Biological Engineering and Soil Sciences, The University of Tennessee, Knoxville, TN 37996
*
Corresponding author's E-mail: [email protected]
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Abstract

Field studies examined the interaction of soil pH with differing levels of atrazine exposure over 4 yr. Soil pH was 5.2 to 7.1 with atrazine exposures ranging from none (0) to eight applications over a 4-yr period (for each year, one application at planting and one early postemergence). The entire plot area was uniformly managed to reduce potential confounding effects due to cropping history, tillage, and other factors. Soil from all plots previously treated with atrazine displayed rapid atrazine dissipation, with half-lives under laboratory conditions being less than 4 d in plots of pH 5.5 or greater and less than 8 d in the field. Soil pH had a marked effect, with slower atrazine dissipation in those plots that had a pH 5.5 or less. This effect of pH and previous atrazine history was consistent in laboratory and field environments. Implications of these findings include probable reduction in weed control due to more rapid atrazine dissipation and potentially reduced loadings into surface water due to this phenomenon.

Keywords

AtrazineEnhanced degradationaccelerated degradation
Type
Soil, Air, and Water
Information
Weed Science , Volume 58 , Issue 4 , December 2010 , pp. 478 - 483
Copyright
Copyright © Weed Science Society of America 

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