期刊
JOURNAL OF FOOD PROTECTION
卷 78, 期 10, 页码 1776-1784出版社
INT ASSOC FOOD PROTECTION
DOI: 10.4315/0362-028X.JFP-15-081
关键词
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资金
- Agriculture and Agri-Food Canada through Canadian Agri-Science Clusters Initiative
- Association des Jardiniers Maraichers du Quebec
- Conseil Quebecois de l'Horticulture
In 2011 and 2012, trials consisting of experimental plots were carried out to evaluate the presence of pathogenic (Listeria monocyto genes, Salmonella) and prevalence of indicator (Escherichia coli) microorganisms in broccoli fertilized with liquid hog manure or mineral fertilizers and irrigated zero, one, or two times with E. coli-contaminated water. In 2011, results showed that E.coli contamination in broccoli heads was affected by the interval between irrigation and sampling (P = 0.0236), with a significant decrease between the first and third day following irrigation (P = 0.0064). In 2012, irrigation frequency significantly increased E. coli prevalence in broccoli samples (P = 0.0499). In 2012, E. coli counts in the soil were significantly influenced by the type of fertilizer applied, as plots receiving liquid hog manure showed higher bacterial counts (P = 0.0006). L. monocytogenes was recovered in one broccoli sample, but geno-serogrouping differentiated the isolate from those recovered in manure and irrigation water. The L. monocytogenes serogroup HA, pulsotype 188 strain was found in six soil samples and in irrigation water applied 5 days before soil sampling. This study highlights the link between E. coli levels in irrigation water, irrigation frequency, and interval between irrigation and harvest on produce contamination. It also demonstrates that L. monocyto genes introduced into the soil following irrigation can persist for up to 5 days.
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