IMAZAQUIN LEACHING IN KARNAK SOIL IN KENTUCKY

Citation
Mn. Sorokina et Gw. Thomas, IMAZAQUIN LEACHING IN KARNAK SOIL IN KENTUCKY, Weed science, 45(5), 1997, pp. 722-726
Citations number
22
Categorie Soggetti
Plant Sciences",Agriculture
Journal title
ISSN journal
00431745
Volume
45
Issue
5
Year of publication
1997
Pages
722 - 726
Database
ISI
SICI code
0043-1745(1997)45:5<722:ILIKSI>2.0.ZU;2-M
Abstract
Imazaquin movement in a field site that had Karnak silty clay soil was evaluated during a 2-yr study to determine if leaching was a signific ant dissipation mode for imazaquin. Imazaquin in water samples collect ed from subsurface tile drainage was measured by immunoassay. Total im azaquin losses due to leaching in 1993 were 0.8% of the total applied and in 1994, practically zero. Imazaquin concentrations as high as 80 mu g L-1 were observed in drain water when rainfall occurred shortly a fter herbicide application. Imazaquin concentrations were lower with e ach successive drain flow event. Higher concentrations of imazaquin we re associated with higher drainage flow, shortly after application. Ho wever, 40 d after application, the levels of imazaquin were low (<7 mu g L-1) even when high tile flow occurred. The time between applicatio n and the first rainfall is an important factor in imazaquin leaching, In the dry growing season of 1994, imazaquin concentration in drain w ater did nor exceed 5 mu g L-1.