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Soil Solution and Mobility Characterization of Imazaquin

Published online by Cambridge University Press:  12 June 2017

Andrew J. Goetz ,
Glenn Wehtje ,
Robert H. Walker  and
Ben Hajek
Andrew J. Goetz
Affiliation:
Dep. Agron. and Soils, Alabama Agric. Exp. Stn., Auburn Univ., AL 36849
Glenn Wehtje
Affiliation:
Dep. Agron. and Soils, Alabama Agric. Exp. Stn., Auburn Univ., AL 36849
Robert H. Walker
Affiliation:
Dep. Agron. and Soils, Alabama Agric. Exp. Stn., Auburn Univ., AL 36849
Ben Hajek
Affiliation:
Dep. Agron. and Soils, Alabama Agric. Exp. Stn., Auburn Univ., AL 36849
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Abstract

Imazaquin {2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-3-quinolinecarboxylic acid} sorption and mobility were studied in five Alabama soils ranging from sandy loam to clay. Techniques included thinlayer soil chromatography, batch equilibrium, and soil solution recovery. Imazaquin was mobile in all soils with Rf values of 0.8 to 0.9. Sorption based on batch equilibrium was minimal with Kd values ranging from 0.001 to 0.21. The soil solution recovery technique was used to evaluate imazaquin sorption in each soil as influenced by imazaquin concentration, wetting and drying, and pH. As herbicide concentration added to the soils was increased from 0.1 to 10 mg/kg, the amount of 14C-imazaquin in soil solution increased. Temporarily drying each soil to 25 or 50% of field capacity resulted in maximum sorption of imazaquin. Lowering the pH enhanced sorption in all soils such that the amount of imazaquin in solution ranged from 38 (low pH) to 100% (high pH). Soil sorption appeared to be governed by the pH-dependent charge surfaces from aluminum and iron oxyhydroxides (specifically hematite and gibbsite) and kaolinite.

Keywords

Herbicide mobilityanion sorptionsoil sorption
Type
Soil, Air, and Water
Information
Weed Science , Volume 34 , Issue 5 , September 1986 , pp. 788 - 793
Copyright
Copyright © 1986 by the Weed Science Society of America 

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References

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