ISSN:
1432-0789
Keywords:
Metolachlor
;
Biodegradation
;
Soil perfusion
;
Microbial metabolites
;
Dechlorination
;
Actinomyces spp.
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
,
Geosciences
,
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Notes:
Summary Degradation of the herbicide metachlor [2-chloro-N-(2-ethyl-6-methylphenyl)-N-(2-methoxy-1-methylethyl)acetamide] was studied in a soil perfusion system. After 28 days of perfusion, the 14CO2 evolved from a Virginia soil (soil A), which had been previously treated with metolachlor (Dual) for 5 years, accounted for 18.4% of the added 14C-metolachlor, while only 3.5% of the 14C was liberated as 14CO2 from a soil of the same field which had no history of Dual treatment (soil B). No 14CO2 was liberated from γ-irradiated soil A. After incubation, metolachlor constituted almost all the extractable 14C in sterile soil A, while about 20% of the added 14C extracted from non-sterile soil A consisted of products of metolachlor; 14.8% was identified as dechlorinated metolachlor. No mineralization occurred in actinomycete-inoculated sterile soil A, but 30% of the added 14C was recovered in the form of transformation products of metolachlor. Our results demonstrate clearly that microbial activity is responsible for the mineralization of metolachlor, and that degradation is enhanced in herbicide-acclimated soils.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00262131
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