Fate of the herbicide clomazone in soil

Laboratory studies were conducted to gain information about the environmental properties of the soil-applied herbicide clomazone. The effects of soil microbial activity, temperature, and moisture on clomazone fate were determined following ($\sp{14}$C) clomazone application to the surface of a Flanagan silty clay loam. Degradation of clomazone was a biologically-dependent process. Following incubation for 84 days at 5 to 35$\sp\circ$C or 100 to 1500 kPa soil water tension, 59% or more of applied clomazone was extracted from soil as parent clomazone. The rate of clomazone dissipation was slower than predicted by a first-order kinetic model. Clomazone mineralization and volatilization were affected more by temperature than by soil moisture. A single detectable metabolite, which appeared rapidly after application but did not accumulate to more than 5% of applied clomazone, was most persistent under the coldest or driest soil conditions tested. Metabolite formation apparently involved cleavage of the isoxazolidinone ring of clomazone and conversion of the carbonyl carbon to CO$\sb2$.

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Agronomy

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2011

Author dc:creator

• Mervosh, Todd Loren

Contributors dc:contributor

• Stoller, Edward W.
• Sims, Gerald K.

• Agriculture, Agronomy
• Environmental Sciences

Statement dc:rights

• Copyright 1994 Mervosh, Todd Loren

Language dc:language

eng

Identifier

AAI9503271
(UMI)AAI9503271

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/18996