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Degradation of methyl isothiocyanate and chloropicrin in forest nursery soils

Permanent URL:
http://handle.nal.usda.gov/10113/7247
File:
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Abstract:
Recent studies have observed enhanced degradation of methyl isothiocyanate (MITC) from repeated fumigation in agricultural soils. Little is known about fumigant degradation in forest and nursery soils. This study was conducted to determine degradation rates of MITC and chloropicrin (CP) in two forest soils and the impacts of nursery management on degradation of MITC and CP. The half-life values of MITC and CP were evaluated in the laboratory under isothermal conditions (22 +/- 2 degrees C). Three rates representing 0.5x, 1x, and 2x field application rates for each fumigant were used in laboratory incubations. Effect of microbial degradation was determined by conducting incubations with both fresh and sterilized soils. Soil moisture effects were also studied. There was no difference in MITC or CP degradation between fumigated and nonfumigated forest nursery soils. Soil sterilization and high soil moisture content (15% by wt.) reduced MITC and CP degradation. The degradation rates of MITC and CP varied with factors such as nursery history, fumigant application rates, and freshness of tested soils.
Author(s):
Zhang, Y. , Spokas, K. , Wang, D.
Subject(s):
forest nurseries , forest soils , methyl isothiocyanate , chloropicrin , soil fumigation , pesticide application , application rate , biodegradation , soil water content , Wisconsin , Georgia
Format:
p. 1566-1572.
Note:
Includes references
Source:
Journal of environmental quality 2005 Sept-Oct, v. 34, no. 5
Language:
English
Year:
2005
Collection:
Journal Articles, USDA Authors, Peer-Reviewed
Rights:
Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.