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Imazaquin leaching in Karnak soil in Kentucky

Published online by Cambridge University Press:  12 June 2017

Marina N. Sorokina  and
Grant W. Thomas
Marina N. Sorokina
Affiliation:
Department of Agronomy, University of Kentucky, Lexington, KY 40546-0091
Grant W. Thomas*
Affiliation:
Department of Agronomy, University of Kentucky, Lexington, KY 40546-0091
*
gthomas@ca.uky.edu.
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Abstract

Imazaquin movement in a field site that had Karnak silty clay soil was evaluated during a 2-yr study to determine if leaching was a significant dissipation mode for imazaquin. Imazaquin in water samples collected from subsurface tile drainage was measured by immunoassay. Total imazaquin losses due to leaching in 1993 were 0.8% of the total applied and in 1994, practically zero. Imazaquin concentrations as high as 80 μg L−1 were observed in drain water when rainfall occurred shortly after herbicide application. Imazaquin concentrations were lower with each successive drain flow event. Higher concentrations of imazaquin were associated with higher drainage flow, shortly after application. However, 40 d after application, the levels of imazaquin were low (<7 μg L−1) even when high tile flow occurred. The time between application and the first rainfall is an important factor in imazaquin leaching. In the dry growing season of 1994, imazaquin concentration in drain water did not exceed 5 μg L−1.

Keywords

Imazaquin, 2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-3-quinolinecarboxylic acidsoybean, Glycine max (L.) MerrHerbicide dissipationtile drainageimmunoassay
Type
Soil, Air, and Water
Information
Weed Science , Volume 45 , Issue 5 , October 1997 , pp. 722 - 726
Copyright
Copyright © 1997 by the Weed Science Society of America 

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