Påvirkning av gjødsel fra storfe på den bakteriologiske kvaliteten til økologisk isbergsalat

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Å undersøke den bakteriologiske kvaliteten, og forekomsten av utvalgte patogene bakterier fra økologisk dyrket isbergsalat gjødslet med storfegjødsel i form av kompost, fast husdyrgjødsel og slam i en to-års feltforsøk.

Forfattere:

Johannessen, G., Frøseth, R., Solemdal, L., Jarp, J., Wasteson, Y. & Rørvik, L.

Publiseringssted:

Journal of Applied Microbiology

Årstall:

2004

Influence of bovine manure as fertilizer on the bacteriological quality of organic Iceberg lettuce

 

Mål

To investigate the bacteriological quality, and the occurrence of selected pathogenic bacteria from organically grown Iceberg lettuce fertilized with bovine manure in the form of compost, firm manure and slurry in a 2-year field trial.

 

Fremgangsmåte

Samples of soil, fertilizer, fertilized soil, seedlings and lettuce were analysed for aerobic plate counts (APC), thermotolerant coliform bacteria (TCB), Escherichia coli, E. coli O157:H7, Salmonella spp. and Listeria monocytogenes.

 

Funn

No difference in bacteriological quality could be shown in lettuce at harvest, however, APC varied significantly from year to year in the study. The various treatments gave significantly different APC and numbers of TCB isolated from fertilized soil. Escherichia coli O157:H7 was isolated from firm manure and slurry, and soils fertilized with the respective fertilizers the second year, but were not recovered from the lettuce.

 

Konklusjon

No difference in bacteriological quality could be detected in lettuce at harvest after application of various types of manure-based fertilizers grown under Norwegian conditions.

The results may indicate that the use of manure does not have considerable influence on the bacteriological quality of organic lettuce. However, others have suggested that there is a risk by using manure. There is a need for more research in the field.

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