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Imazaquin Persistence and Mobility in Three Arkansas Soils

Published online by Cambridge University Press:  12 June 2017

Gary Basham,
Terry L. Lavy,
Lawrence R. Oliver and
H. Don Scott
Gary Basham
Affiliation:
Univ. Arkansas, Dep. Agron., Fayetteville, AR 72701
Terry L. Lavy
Affiliation:
Univ. Arkansas, Dep. Agron., Fayetteville, AR 72701
Lawrence R. Oliver
Affiliation:
Univ. Arkansas, Dep. Agron., Fayetteville, AR 72701
H. Don Scott
Affiliation:
Univ. Arkansas, Dep. Agron., Fayetteville, AR 72701
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Abstract

Field persistence of imazaquin {2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-3-quinolinecarboxylic acid} applied preemergence as high as 16 times the 0.14 kg ai/ha recommended rate was studied at two locations in Arkansas in 1984 and 1985. Rapid dissipation of these high rates occurred on the Taloka silt loam under hot, dry field conditions in 1984 when no rainfall occurred for 2 weeks after application. In 1985, when furrow irrigation was applied 7 days after application, imazaquin phytotoxicity was greater and dissipation was delayed. Imazaquin persistence and soil adsorption were greater on Sharkey silty clay than on Taloka silt loam. Following 3- and 8-cm irrigation, 84 and 78%, respectively, of the 14C-labeled imazaquin remained in the surface 5 cm, but in plots covered between rainfalls and receiving 8 cm rain, 74% leached out of this top layer. Since nonincorporated imazaquin dissipated rapidly under hot, dry field conditions, carryover into the next growing season or leaching below the plow layer would not be expected. However, in cool, wet conditions immediately after application, the weakly adsorbed imazaquin molecule was readily bioavailable and mobile in the soil profile.

Keywords

Greenhouse bioassaypreemergence applicationleachingphytotoxicity

Information

Type
Soil, Air and Water
Information
Weed Science , Volume 35 , Issue 4 , July 1987, pp. 576 - 582
Copyright
Copyright © 1987 by the Weed Science Society of America 

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References

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