Re: [compost_tea] Re: barometric pressure and compost tea Oxygen levels

From: <soilfoodweb_at_aol.com>
Date: Fri, 10 Oct 2003 01:27:55 -0400

The problem was not with the oxygen probes. They read within a few tenths of each other when calibrated at room air levels, and they were within a few mg/L of the temp - barometric pressure proper readings.

If you boil water, and drive out all the oxygen, let the water cool without shaking, then that should give you a very close to zero reading.

The differences in readings was the result of microbial growth in the tea brew using up oxygen faster than the bubblers were adding oxygen back in. The more rapid the microbial growth, the sooner the brew went anaerobic, and the greater the growth of ANAEROBIC bacteria.

Elaine Ingham
President, Soil Foodweb Inc.
SFI Corvallis, OR
SFI Port Jefferson, NY
SFI Lismore, NSW, Australia
SFI Hilversum, The Netherlands
SFI Cambridge, New Zealand
www.soilfoodweb.com

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Received on Fri Oct 10 2003 - 08:26:24 EDT

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