Re: [compost_tea] Re: Alaska compost tea

From: Michael Harvey <mharvey_at_westnet.com.au>
Date: Sat, 25 Jan 2003 11:16:08 +0800

Elaine,
Could you expand upon this comment re "....fine air bubbles chew up the org=
anisms in the tea..."
I have not been aware of this till now, how fine are these air bubbles you =
are refering to?
 
Regards
Mike Harvey.
New Life Soils

  You need a decent air pump, and a way to get reasonably coarse air bubble=
s into the tea brew. Please be aware that fine air bubbles chew up the org=
anisms in the tea.

  The measure of oxygen you want to use is oxygen concentration, not percen=
t dissolve oxygen. You need above 6 ppm, or 6 mg O2 per L. At sea level, =
at 72 F, the typical oxygen concentration is around 9 to 9.5 mg oxygen per =
L.

  If you are reading dissolved oxygen versus dissolved carbon dioxide, you =
should have around 80 to 95% DO.

  If you are reading percent oxygen, as part of atmospheric oxygen, oxygen =
should be in the 16 to 21% range.

  Depends on how you are measuring, so let me know what scale you are using=
.

  Elaine
  President, Soil Foodweb Inc.
  www.soilfoodweb.com
       
       
       





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Received on Sat Jan 25 2003 - 02:20:20 EST

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