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Photolysis of Imidazolinone Herbicides in Aqueous Solution and on Soil

Published online by Cambridge University Press:  12 June 2017

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

The photolytic degradation of several imidazolinone herbicides in solution and on soil was investigated. Ultraviolet light caused 100% degradation of imazaquin, imazethapyr, and imazapyr, and 87 and 8% degradation of imazamethabenz and atrazine in aqueous solutions, respectively, after 48 h. The order of susceptibility to photolysis in decreasing order was imazaquin = imazethapyr > imazapyr > imazamethabenz > atrazine. In soil Studies, 45% of imazaquin and 52% of imazethapyr dissipated from moist sand after 48 h of exposure. Herbicide dissipation on air-dry sand and on field capacity and air-dry silty clay loam was less than 10% in most instances. Atrazine photolysis was not detected. This research indicates that photolysis of imidazolinone herbicides in solution is rapid. Photolysis on soil occurs readily on coarse-textured wet soils probably due to greater availability of the herbicide for photochemical alteration.

Keywords

Atrazine, 6-chloro-N-ethyl-N′-(1-methylethyl)-1,3,5-triazine-2,4-diamineimazamethabenz, (±)-2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-4(and 5)-methylbenzoic acid (3:2)imazapyr, (±)-2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-3-pyridinecarboxylic acidimazaquin, 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 acidwild mustard, Sinapsis arvensis L. # SINARPhotodegradationsoil water potentialsoil textureultraviolet light
Type
Soil, Air, and Water
Information
Weed Science , Volume 40 , Issue 1 , March 1992 , pp. 143 - 148
Copyright
Copyright © 1992 by the Weed Science Society of America 

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