[Stoves] White deposit on bottom of pots

[frank]

Dean,

Thinking it might be ammonium chloride if it is 'loose' and very water 
soluble.. We test for chloride in ash because it forms in droplets and 
becomes very corrosive. This drop being acid will be a magnet for 
ammonia vapors. I have recently found in some work I did for Crispin 
that char gas about 5000 mg/kg nitrogen. Perhaps as the pot cools down 
water condenses on the bottom(?) and collects the vapors.
Squirt some di water on it and wash it into a zip-lock bag. Send it to 
me and I will see if i can find out.

Also; the high N value in char may account for the benifit in soil.

Frank


Dean Still wrote:

>Dear Tom,
>
>Here's a question that has puzzled me for years. What is the white deposit
>left by burning charcoal on the bottom of the pot?
>
>All Best,
>
>Dean
>
>
>
>
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-- 
Frank Shields
Soil Control Lab
42 Hangar way
Watsonville, CA  95076
(831) 724-5422 tel
(831) 724-3188 fax
frank at compostlab.com
www.compostlab.com