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Microbial and Photolytic Dissipation of Imazaquin in Soil

Published online by Cambridge University Press:  12 June 2017

G. W. Basham  and
T. L. Lavy
G. W. Basham
Affiliation:
Univ. Arkansas, Altheimer Lab., Rte. 11, Box 83, Fayetteville, AR 72703
T. L. Lavy
Affiliation:
Univ. Arkansas, Altheimer Lab., Rte. 11, Box 83, Fayetteville, AR 72703
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Abstract

Microbial degradation of imazaquin {2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-3-quinolinecarboxylic acid} was monitored by measuring 14CO2 evolution for 7 months under controlled laboratory conditions. Up to 10% of the 14C chain-labeled imazaquin that was applied to a Crowley silt loam was evolved as 14CO2 in 7 months. Less evolution of 14CO2 occurred on a Sharkey silty clay, a soil with higher clay and organic matter content, than on silt loam soils. The loss of 66 to 100% of the imazaquin applied to a Crowley silt loam incubated for 8 months at 18 C or 35 C, respectively, suggested that metabolic changes in addition to CO2 evolution were occurring. Rapid loss of imazaquin phytotoxicity occurred when soils were held at warm-moist (35 C and −33 kPa) conditions conducive to microbial growth. Imazaquin was more persistent in soils stored under cool, dry (18 C and −100 kPa) conditions. Imazaquin on a soil surface dissipated rapidly when exposed to ultraviolet light or sunlight. Photodecomposition could be a major mode of imazaquin dissipation if this herbicide is allowed to remain on the soil surface.

Keywords

14CO2 evolutionincubationultraviolet lightvolatilizationpersistencephotodecomposition
Type
Soil, Air, and Water
Information
Weed Science , Volume 35 , Issue 6 , November 1987 , pp. 865 - 870
Copyright
Copyright © 1987 by the Weed Science Society of America 

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References

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