[compost_tea] New to me, anyone have peer reviewed data contray to report?

From: tomjasz <tom_at_livesoil.com>
Date: Fri, 08 Oct 2004 16:22:49 -0000

Research Project: Safe Production of Vegetables Using Manure
Location: Environmental Microbial Safety Laboratory
Title: Growth of Foodborne Pathogens During Production of Compost Tea
Authors
      Ingram, David
      Millner, Patricia
Submitted to: International Association For Food
ProtectionPublication Acceptance Date: July 20, 2004Publication Date:
August 10, 2004Technical Abstract: Compost tea (CT) is increasingly
used in various cropping systems as a non-chemical foliar spray or
soil drench to promote plant growth and suppress disease. We examined
the potential for foodborne pathogen bacteria to grow during certain
tea production practices. This study addressed the influence of pre-
packaged, commercial additives, such as unsulphured molasses, soluble
kelp, humic materials and proprietary 'nutrient solution'
preparations on the survival and growth of E. coli O157:H7,
Salmonella enterica serovar Typhimurium and Enterococci faecalis
during the tea production. Commercially available, mature compost
with undetectable numbers of target bacteria was used to produce CT
aerobically (dissolved oxygen > 7 ppm) in 18.9L containers in 24
hours. Aliquots of compost were inoculated or not with small amounts
of target strains (pre-conditioned for growth on compost) and placed
into mesh retainers which were immersed in the brewing bucket with
dechlorinated tap water. Test batches included varying amounts of
inoculum and commercial additives. In general, target foodborne
pathogens grew in CT that contained additives, and did not grow in
the absence of additives. Results show that soluble carbon additives
in CT production promote growth from even small concentrations of
pathogens present in a matrix containing large concentrations of
heterotrophic bacteria. The concept that the diversity of
heterotrophs in compost is sufficient to inhibit growth of the target
pathogens was not supported by this data when soluble carbon
additives were supplied. The benefits of soluble carbon supplements
in CT warrants further study. Citation: Ingram, D.T., Millner, P.D.
2004. Growth Of Foodborne Pathogens During Production Of Compost Tea.
[abstract]. International Association For Food Protection. August 10-
12, 2004, Phoenix, Arizona. P.2.





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Received on Fri Oct 08 2004 - 12:52:28 EDT

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