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Nos résultats de recherche - Liste |
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Type :
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Articles scientifiques
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Auteur(s) :
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Côté, C. et S. Quessy
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Année :
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2005
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Titre :
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Persistence of Escherichia coli and Salmonella in surface soil following application of liquid hog manure for production of pickling cucumbers
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Orientation :
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Proposer des stratégies d'élevage et de gestion des déjections animales
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Publication :
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J. Food Prot.
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Volume :
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68
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Pages :
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900-905.
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Résumé :
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Liquid hog manure is routinely applied to the land as a crop fertilizer. However, this practice raises food safety concerns, especially when manure is used on fruit and vegetable crops. The objectives of this project were to evaluate the persistence of E. coli and Salmonella in surface soil after liquid hog manure spreading on pickling cucumbers fields and to verify the microbiological quality of harvested products. Mineral fertilizers were replaced by liquid hog manure at various ratios in the production of pickling cucumbers in a three year field study. The experimental design was a randomized complete block comprising four repetitions on a sandy loam (years 1, 2 and 3) and on a loamy sand (year 3). Soil samples were taken at a depth of 20 cm fortnightly after a June application of organic and inorganic fertilizers. Vegetable samples were also taken at harvest time. Liquid hog manure, soil and vegetables (washed and unwashed) samples were analyzed to detect Salmonella and Escherichia coli. An exponential decrease of Escherichia coli populations was observed in surface soil after the application of manure. The estimated average time required to reach undetectable levels of E. coli in sandy loam varied from 56 to 70 days while it was estimated at 77 days in loamy sand. The maximal Salmonella persistence in soil was 54 days. E. coli and Salmonella were not detected in any vegetables samples.
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