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Re: [compost_tea] Re: Alaska compost tea



Elaine,
Could you expand upon this comment re "....fine air bubbles chew up the organisms 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 bubbles into the tea brew.  Please be aware that fine air bubbles chew up the organisms in the tea.

The measure of oxygen you want to use is oxygen concentration, not percent 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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