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Metabolism of 14C-Pronamide in the Soil and in Lettuce (Lactuca sativa) under Field Conditions

Published online by Cambridge University Press:  12 June 2017

Jean Rouchaud ,
Chantal Moons ,
Frans Benoit ,
Norbert Ceustermans  and
Henri Maraite
Jean Rouchaud
Affiliation:
Univ. Cath. Louvain, Louvain-la-Neuve, Belgium
Chantal Moons
Affiliation:
Univ. Cath. Louvain, Louvain-la-Neuve, Belgium
Frans Benoit
Affiliation:
St. Kathelijne-Waver, Belgium
Norbert Ceustermans
Affiliation:
St. Kathelijne-Waver, Belgium
Henri Maraite
Affiliation:
Phytopathol. Univ. Cath. Louvain
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Abstract

Metabolism of 14C-pronamide [N-(1,1-dimethylpropynyl)-3,5-dichlorobenzamide, carbonyl- 14C] was studied in silt loam soil (located in Louvain-la-Neuve, Belgium) and in lettuce (Lactuca sativa L., ‘Appia′, Clause3) from a crop planted in soil that had been treated before planting. During the experiment, most of the 14C remained in the 0- to 6-cm soil layer. The percentage of 14C-pronamide degraded to 14CO2 during the experiment was less than 10%. The soil-extractable 14C was made up of pronamide and its first ketone metabolite [N-(1,1-dimethylacetonyl)-3,5-dichlorobenzamide]. About 30% of the pronamide present in the soil was bound to the soil. The bound residue, i.e., the 14C that could not be extracted by acetone, at lettuce harvest was about 80% of the 14C contained in the soil at that time; 3,5-dichlorobenzoic acid was the main component of the bound residue. The harvested lettuce also contained pronamide, the ketone, and 3,5-dichlorobenzoic acid. Similar kinetics of metabolism were observed with lettuces grown on loamy sand soil (located in St. Kathelijne-Waver, Belgium). However, pronamide was not bound to this type of soil.

Keywords

Ketone metabolite3,5-dichlorobenzoic acid bound residuerepeated culturesaccumulation
Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 35 , Issue 4 , July 1987 , pp. 469 - 475
Copyright
Copyright © 1987 by the Weed Science Society of America 

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References

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