Variability of retention process of isoxaflutole and its diketonitrile metabolite in soil under conventional and conservation tillage

BACKGROUND: Sorption largely controls pesticide fate in soils because it influences its availability for biodegradation or transport in the soil water. In this study, variability of sorption and desorption of isoxaflutole (IFT) and its active metabolite diketonitrile (DKN) was investigated under con...

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Bibliographic Details
Published in:Pest management science 2012-04, Vol.68 (4), p.610-617
Main Authors: Alletto, Lionel, Benoit, Pierre, Bergheaud, Valérie, Coquet, Yves
Format: Article
Language:English
Subjects:
Adsorption
Agriculture - methods
Avena - chemistry
Avena - growth & development
Avena - metabolism
Biodegradation
Biodegradation, Environmental
Biological and medical sciences
crop residues
Desorption
Fundamental and applied biological sciences. Psychology
herbicide
Herbicides - chemistry
Herbicides - metabolism
Isoxazoles - chemistry
Isoxazoles - metabolism
Life Sciences
Metabolites
mulch tillage
Nitriles - chemistry
Nitriles - metabolism
Parasitic plants. Weeds
Pest control
Phytopathology. Animal pests. Plant and forest protection
Soil - chemistry
Sorption
Sulfones - chemistry
Sulfones - metabolism
Tillage
Weeds
Zea mays - chemistry
Zea mays - growth & development
Zea mays - metabolism
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Summary:BACKGROUND: Sorption largely controls pesticide fate in soils because it influences its availability for biodegradation or transport in the soil water. In this study, variability of sorption and desorption of isoxaflutole (IFT) and its active metabolite diketonitrile (DKN) was investigated under conventional and conservation tillage. RESULTS: According to soil samples, IFT KD values ranged from 1.4 to 3.2 L kg−1 and DKN KD values ranged from 0.02 to 0.17 L kg−1. Positive correlations were found between organic carbon content and IFT and DKN sorption. IFT and DKN sorption was higher under conservation than under conventional tillage owing to higher organic carbon content. Under conservation tillage, measurements on maize and oat residues collected from the soil surface showed a greater sorption of IFT on plant residues than on soil samples, with the highest sorbed quantities measured on maize residues (KD ≈ 45 L kg−1). Desorption of IFT was hysteretic, and, after five consecutive desorptions, between 72 and 89% of the sorbed IFT was desorbed from soil samples. For maize residues, desorption was weak (
ISSN:1526-498X
1526-4998
DOI:10.1002/ps.2304