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Adsorption, Desorption, and Degradation of Imidazolinones in Soil

Published online by Cambridge University Press:  20 January 2017

Tracy M. Aichele  and
Donald Penner
Tracy M. Aichele
Affiliation:
Department of Geography, Michigan State University, East Lansing, MI 48824-1325
Donald Penner*
Affiliation:
Department of Crop and Soil Sciences, Michigan State University, East Lansing, MI 48824-1325
*
Corresponding author's E-mail: pennerd@msu.edu
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Abstract

The fate of imazamox, imazethapyr, and imazaquin in soil was evaluated at various soil moisture levels and at soil pH levels of 5 and 7. The percentage of each herbicide sorbed, desorbed, dissipated, and metabolized over time was compared. Soil was kept at its field pH (pH 7) or modified to a lower pH (pH 5) and equilibrated to field moisture contents ranging from 0.27 to 0.21 g water/ g soil, at and below the field capacity of the soil. Soil moisture in the range studied did not affect the fate of the herbicides. The percentage of applied herbicide found in soil solution was greatest for imazamox and least for imazaquin (imazamox > imazethapyr > imazaquin) and was greater at pH 7 than at pH 5 for all three herbicides. Over time, less herbicide was in the soil solution and less was desorbed. Metabolism followed the same pattern. Among the herbicides, metabolism followed the following sequence, imazamox > imazethapyr > imazaquin with metabolism greater at pH 7 than at pH 5 for all three herbicides. At pH 7, the half-life for imazamox was 1.4 wk and for imazethapyr was 16 wk, and the estimated half-life for imazaquin was 191 wk.

Keywords

ImazamoximazaquinimazethapyrAnionic herbicidecarryoverdissipationfatemetabolismpersistencepKasoil moistureLSCliquid scintillation counting
Type
Research Article
Information
Weed Technology , Volume 19 , Issue 1 , March 2005 , pp. 154 - 159
Copyright
Copyright © Weed Science Society of America 

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