Yep, believe it or not, I have actually read up on the use of char in those ancient cultures. Turned crappy ground into very stable, fertile ground.Ya, that would be a problem with too much ash- the char is the charcoal- very different composition.
We used to compost hogs at a farm I worked on by burying them in sawdust. Didn't take long to get rid of a 500 lb sow in a hot pile. Never had any 'yote trouble.
Right- that's why I said "with good compost levels". urine only adds N, so compost would be a better option I think than urineBio Char is not just charcoal. Its charcoal that is mixed with compost. Fresh charcoal can be detriment to a garden as it actually absorbs available nutirents and fixes them in the charcoal. The tera preta excavations show that the ancient farmers mixed a lot od orgainics in with it. I ran into a bio char proponent last summer and I asked him how he added nurtients to his bio- char, his recomendation was to pee in it. As long as it didnt smell it was absorbing the urine. Once it started smelling he knew it was ready for the garden. I always thought that it might be a good idea to mix bio char with chicken litter or hog manure as both are too strong for most plants but the biochar would grab a lot of the nitrogen and amonia and fix it into the char so that it released slowly.
If the US ever gets into CO2 sequestration, there are some interesting potential scams where some one wouls partially gasifie wood and generate power with the volatiles, then buries the bio char to get credit for the carbon sequestration.
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