[compost_tea] Bovine manure as fertilizer -- effect on bacteria in organic Iceberg lettuce

From: Steve Diver <steved_at_ncat.org>
Date: Sun, 21 Mar 2004 04:51:39 -0000

Journal of Applied Microbiology
Volume 96 Issue 4 Page 787 - April 2004
doi:10.1111/j.1365-2672.2004.02208.x

http://www.blackwell-synergy.com/links/doi/10.1111
/j.1365-2672.2004.02208.x/abs/

Influence of bovine manure as fertilizer on the bacteriological
quality
of organic Iceberg lettuce
G.S. Johannessen, R.B. Frøseth, L. Solemdal, J. Jarp, et al

Abstract

Aim: 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.

Methods and Results: 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 . 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.

Conclusions: 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.

Significance and Impact of the Study: 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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Received on Sun Mar 21 2004 - 00:37:32 EST

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