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Effects of Imazaquin Residues on Cotton (Gossypium hirsutum)

Published online by Cambridge University Press:  12 June 2017

Clyde J. Barnes ,
Andrew J. Goetz  and
Terry L. Lavy
Clyde J. Barnes
Affiliation:
Dep. Agron., Altheimer Lab., Univ. Arkansas, Fayetteville, AR 72701
Andrew J. Goetz
Affiliation:
Dep. Agron., Altheimer Lab., Univ. Arkansas, Fayetteville, AR 72701
Terry L. Lavy
Affiliation:
Dep. Agron., Altheimer Lab., Univ. Arkansas, Fayetteville, AR 72701
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Abstract

Field and laboratory studies were conducted in 1987 and 1988 on several Arkansas soils to determine the effects of residual levels of imazaquin on cotton. Imazaquin concentrations ranging from 0.007 to 0.024 μg/g and 0.00 to 0.015 μg/g were found in soil samples taken 12 and 24 months, respectively, following preplant-incorporated applications at rates of 140 g/ha. Cotton yields were reduced from 7 to 42% in 1987 as the soil concentration of imazaquin increased from 0.007 to 0.024 μg/g. Imazaquin persistence was greater in clay soils than loams or sandy loams. Imazaquin was weakly adsorbed to a clay, loam, and sandy loam soil in laboratory studies; the adsorption isotherms did not differ significantly by soil texture. A bioassay utilizing cotton as the indicator species was developed to determine imazaquin concentrations in soils ranging from 0 to 0.06 μg/g. Imazaquin concentrations determined by the bioassay method were found to be 75, 77, and 80% of those determined by chemical extractions for a clay, loam, and sandy loam soil, respectively.

Keywords

Imazaquin, 2-[4,5-dihydro − 4 - methyl − 4 - (1-methylethyl)-5-oxo-1H-imidazol-2-yl]-3-quinolinecarboxylic acidcotton, Gossypium hirsutum L. ‘Stoneville 506′soybean, Glycine max L. MerrHerbicide adsorptionimazaquin bioassayimazaquin dissipation
Type
Soil, Air, and Water
Information
Weed Science , Volume 37 , Issue 6 , November 1989 , pp. 820 - 824
Copyright
Copyright © 1989 by the Weed Science Society of America 

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References

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