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Soil Degradation of Metazachlor in Agronomic and Vegetable Crop Fields

Published online by Cambridge University Press:  12 June 2017

Jean Rouchaud ,
Marc Metsue ,
Michel Van Himme ,
Robert Bulcke ,
Joel Gillet  and
Luc Vanparys
Jean Rouchaud
Affiliation:
Lab. Phytopathol., Catholic Univ. Louvain, 1348 Louvain-1a-Neuve
Marc Metsue
Affiliation:
Lab. Phytopathol., Catholic Univ. Louvain, 1348 Louvain-1a-Neuve
Michel Van Himme
Affiliation:
Weed Res. Group, State Univ. Gent, 9000 Gent
Robert Bulcke
Affiliation:
Weed Res. Group, State Univ. Gent, 9000 Gent
Joel Gillet
Affiliation:
State School Hortic., 5800 Gembloux
Luc Vanparys
Affiliation:
Agric. Hortic. Res. Stat., 8810 Rumbeke
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Abstract

Metazachlor degradation in soil was studied in fields of spring barley, turnips, brussels sprouts, and leeks. Metazachlor in soil was transformed into 2-hydroxy-N-(2,6-dimethylphenyl)-N-(1H-pyrazol-1-yl methyl)-acetamide (compound 2), 2-chloro-N-(2,6-dimethylphenyl)-acetamide (compound 3), and 4,4′-methylenebis-(2,6-dimethylbenzenamine) (compound 4). Soil concentrations of compound 4 were always lower than 0.1 ppm. The half-life of metazachlor in the 0- to 10-cm soil layer was 1 to 3 mo. Metazachlor and compounds 2, 3, and 4 were not detected in the 10- to 20- and 20- to 30-cm soil layers. Metazachlor and metabolites (compounds) 2, 3, and 4 were not detected in barley grain or in the edible part of the vegetables. The sensitivity limit for these compounds was 0.02 ppm.

Keywords

Metazachlor, 2-chloro-N-(2,6-dimethylphenyl)-N-(1H-pyrazol-1-ylmethyl)-acetamidespring barley, Hordeum vulgare L., subsp. hexastichon ‘Apex’turnip, Brassica napus L., subsp. napus ‘Leielander’brussels sprouts, Brassica oleracea L., subsp. Gemmifera, ‘Acropolis’leeks, Allium porum L., subsp. ‘Alberta’lettuce, Lactuca sativa L., ‘Hilde’cabbage, Brassica oleracea L., subsp. Bullata, ‘Savoy King’Persistencesoil residuesleaching
Type
Soil, Air, and Water
Information
Weed Science , Volume 40 , Issue 1 , March 1992 , pp. 149 - 154
Copyright
Copyright © 1992 by the Weed Science Society of America 

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References

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