NDLI: A new concept for reduction of diffuse contamination by simultaneous application of pesticide and pesticide-degrading microorganisms

Content Provider	Springer Nature Link
Author	Önneby, Karin Jonsson, Anders Stenström, John
Copyright Year	2009
Abstract	Pesticide residues and their transformation products are frequently found in groundwater and surface waters. This study examined whether adding pesticide-degrading microorganisms simultaneously with the pesticide at application could significantly reduce diffuse contamination from pesticide use. Degradation of the phenoxyacetic acid herbicides MCPA (4-chloro-2-methylphenoxyacetic acid) and 2,4-D (2,4-dichlorophenoxyacetic acid) was studied in soil microcosm experiments after simultaneous spraying of herbicide and herbicide-degrading bacteria on an agricultural soil and on a sand with low degradation potential. The latter represented pesticide use on non-agricultural soils poor in microbial activity. Degradation and possible loss of herbicidal effect were also tested in a system with plants and the amounts of bacteria needed to give satisfactory MCPA-degradation rate and the survival of degrading bacteria in formulated MCPA were determined. The results showed >80–99% degradation of 2,4-D and MCPA in soil within 1 day and >99% within 3 days after inoculation with 105–107 herbicide-degrading bacteria g−1 dry weight of soil. Enhanced degradation of MCPA was also obtained in the presence of winter wheat and white mustard without loss of the intended herbicidal effect on white mustard. The survival of an isolated MCPA-degrading Sphingomonas sp. in three realistic concentrations of formulated MCPA was very poor, showing that in practical applications direct contact between the microorganisms and the pesticide formulation must be precluded. The applicability and economic feasibility of the method and the information needed to obtain a useable product for field use are discussed.
Starting Page	21
Ending Page	29
Page Count	9
File Format	PDF
ISSN	09239820
Journal	Biodegradation
Volume Number	21
Issue Number	1
e-ISSN	15729729
Language	English
Publisher	Springer Netherlands
Publisher Date	2009-06-26
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Pesticides Diffuse pollution Sphingomonas Bioprophylaxis Bioaugmentation Waste Management/Waste Technology Waste Water Technology / Water Pollution Control / Water Management / Aquatic Pollution Terrestrial Pollution Geochemistry Soil Science & Conservation Microbiology
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Pollution Environmental Engineering Bioengineering Microbiology

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