The message
from "Mike Lyle" contains these words:

I suppose they make and then evaporate aqueous solutions, which seems
an expensive procedure. I imagine guano is involved. I think
naturally-occurring nitrates would be allowed under organic rules, so
Chile nitre could be used too.

Hmmm. Pee on the bonfire heap and you'll get all the nitre you need...

--
Rusty
Open the creaking gate to make a horrid.squeak, then lower the foobar.
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