[compost_tea] Why There are Spores in Peat - Pasteurization vs. Sterilization

From: chriscreid <reidchris_at_earthlink.net>
Date: Thu, 06 Nov 2003 03:42:51 -0000

Only recently did I get clear about the difference between
pasteurization and sterilization, while surfing through some
mushroom farming sites. Here's a quote that encapsulates the
difference:

The pasteurization is carried out for a prolonged time at around 170°
F and is supposed to kill only heat susceptible organisms and their
spores, while sterilization works at a temperature of 250°F and is
supposed to kill all organisms.
The beneficial microorganisms(mainly bacteria)that are left alive
when pasteurizing, guard the substrate against other contaminants,
for instance different molds, but don't affect the growth of
mushroom mycelium.
Pasteurization is used for bulk substrates like straw, dung and
composts and wood chips, also casings, and sterilization for all
high nutritious substrates, like different grains.

This info is from:

http://www.shroomery.org/index/par/23371

Chris Reid


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Received on Thu Nov 06 2003 - 02:50:26 EST

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