Re: [compost_tea] Re: C:N
The first reference below (ranchmondo) ends with
"... put in about 30 times more carbonaceous material (estimate wt.)
than nitrogenous material (guess at dry wt.). "
Well that doesn't make sense to me. Just look at the ratios quoted higher
up the page
"sawdust 150-200 leaves from oak, maple 40-60
peatmoss 50 sun-dried grass clippings 20
straw 50-150 hay from legumes 15
raw garbage 25 fresh grass clippings 15
cow manure 30 fresh garden debris 20"
If I was using sawdust ( say 175 and and so carbonaceous) and legume hay (15
and nitrogenous) to
make compost and used the 30:1 suggested ratio by weight, I would have
(175 x 30) + 15 = 5265 parts Carbon, and (1 x 30) + 1 = 31 parts Nitrogen.
Dividing by 31,
I get C:N of 175:1 to start composting with.
To get 30:1, I would need to solve ((175 x X) + 15) / (X + 1) = 30
where X is the quantity of sawdust to put with the hay
X = 15/145 = approx 0.1 (actually 1.034)
So, in this case, I would need 0.1 parts sawdust to one part legume hay, not
the 30 suggested.
Obviously the proportions of input materials to add to the heap will vary
according to what the materials are.
Lynton
>
> <http://www.ranchomondo.com/compost/cnratio.htm>
> http://www.ranchomondo.com/compost/cnratio.htm
>
>
>
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Received on Tue Dec 21 2004 - 18:52:44 EST
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: Tue Feb 07 2012 - 14:15:39 EST