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Effect of Wetting/Drying Cycles on Dissipation Patterns of Bioavailable Imazaquin

Published online by Cambridge University Press:  12 June 2017

Todd A. Baughman  and
David R. Shaw
Todd A. Baughman
Affiliation:
Dep. Plant & Soil Sci., Miss. State Univ., Mississippi State, MS 39762
David R. Shaw
Affiliation:
Dep. Plant & Soil Sci., Miss. State Univ., Mississippi State, MS 39762
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Abstract

Greenhouse experiments determined differences in imazaquin bioavailability over time under various soil moisture regimes. All soils were initially fortified with 63 ppb (w/w) of commercially formulated imazaquin. Treatments consisted of maintaining at field capacity for 15 wk (FC), maintaining air-dry for 15 wk (AD), soil that was maintained air-dry for 2 wk and then wet to field capacity at 2 wk intervals (2WAD), and soil that was wet to field capacity at the initiation of the experiment and at 2 wk intervals (2WFC). Little dissipation of imazaquin occurred in the AD soil over the 100 d of this study. Rapid dissipation over the first 35 d occurred for the other three treatments. Imazaquin half-life ranged from 17 to 18 d for the FC, 2WAD, and 2WFC soils. Imazaquin concentration increased or only slightly decreased in samples taken after the second watering in both the 2WAD and the 2WFC soils. Due to differences in adsorption/desorption of imazaquin with changing soil moisture levels, bioassays may not determine the dissipation of the actual concentration of imazaquin contained in soil.

Keywords

Imazaquin, 2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-3-quinolinecarboxylic acidcorn Zea mays L. ‘HyPerformer HS 9773.’Bioavailabilitydissipationhalf-lifepersistencesoil bioassaysoil moisture
Type
Soil, Air, and Water
Information
Weed Science , Volume 44 , Issue 2 , June 1996 , pp. 380 - 382
Copyright
Copyright © 1996 by the Weed Science Society of America 

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