Abstract

Abstract Organic soils on 28 farms located in six widely separated vegetable growing areas in southwestern Ontario were sampled in 197 6 and analyzed for insecticide residues. Soil organic content generally was >65%. Organochlorine insecticide residues were detected in soil on all farms. Total DDT ranged from organophosphorus>cyclodiene>carbamate insecticide residues. Area averages of total insecticide concentration (ppm) in the six marshes were: Colbar 30.2, Holland ...

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