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Soil pH Effect on Imazaquin Persistence in Soil

Published online by Cambridge University Press:  12 June 2017

Brian H. Marsh  and
Randy W. Lloyd
Brian H. Marsh
Affiliation:
Dep. of Agron., Kansas State Univ., Manhattan, KS 66506-5501
Randy W. Lloyd
Affiliation:
American Cyanamid, Overland Park, KS 66223
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Abstract

Field studies were conducted to determine the effect of soil pH ranging from 5.1 to 7.1 on imazaquin persistence on a Grundy silty clay loam (2.8% OM). Imazaquin residues were equivalent at pH 5.5 or higher but persisted longer at pH 5.1. Corn shoot growth was not different at any soil pH. Corn grain yields in 1993 were lower in imazaquin-treated plots than in the check plots at the lowest pH (5.1), where initial imazaquin soil concentrations were between 10 and 13 μg/kg across all pH levels. Corn grain yields were not affected by herbicide carryover in 1994 where soil imazaquin residues were well below critical levels at planting. Yields were lower where soil pH was less than 5.5.

Keywords

Imazaquin, 2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-3-quinolinecarboxylic acidcorn, Zea mays L.Carryoverherbicide
Type
Research
Information
Weed Technology , Volume 10 , Issue 2 , June 1996 , pp. 337 - 340
Copyright
Copyright © 1996 by the Weed Science Society of America 

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