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Effects of Tillage and Application Method on Clomazone, Imazaquin, and Imazethapyr Persistence

Published online by Cambridge University Press:  12 June 2017

William S. Curran ,
Rex A. Liebl  and
F. William Simmons
William S. Curran
Affiliation:
Dep. Agron., Univ. Illinois, 1102 S. Goodwin Ave., Urbana, IL 61801
Rex A. Liebl
Affiliation:
Dep. Agron., Univ. Illinois, 1102 S. Goodwin Ave., Urbana, IL 61801
F. William Simmons
Affiliation:
Dep. Agron., Univ. Illinois, 1102 S. Goodwin Ave., Urbana, IL 61801
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Abstract

Effects of tillage and herbicide application method on the persistence and residual activity of clomazone, imazaquin, and imazethapyr were investigated in a 2-yr field study. Herbicides were applied preemergence and preplant incorporated to conventional- and reduced-tillage soybeans in 1987 and 1988. Herbicide dissipation was monitored using chromatographic and bioassay techniques. In 1987, dissipation rates for clomazone, imazaquin, and imazethapyr were similar, regardless of tillage system or application method. In 1988, all three herbicides applied preplant incorporated dissipated more slowly than in preemergence treatments. Corn planted in rotation in 1989 displayed greater levels of injury in the incorporated treatments for all three herbicides. Although herbicide concentrations were similar 322 d following application in both tillage treatments in 1989, corn injury was greater with imazaquin and imazethapyr and less with clomazone in the reduced-tillage plots than in the conventional-tillage treatments.

Keywords

Clomazone, 2-[(2-chlorophenyl)methyl]-4,4-dimethyl-3-isoxazolidinoneimazaquin, 2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-3-quinolinecarboxylic acidimazethapyr, (±)-2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-5-ethyl-3-pyridinecarboxylic acidcorn, Zea mays L. ‘Pioneer 3377’Herbicide dissipationbioassayreduced tillageno-till
Type
Soil, Air, and Water
Information
Weed Science , Volume 40 , Issue 3 , September 1992 , pp. 482 - 489
Copyright
Copyright © 1992 by the Weed Science Society of America 

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