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Re: Terra Preta
Experimenting today with grinding up lump charcoal, I found that using a pair of pliers worked the best. I don't think putting a brick in a large sealed can and rolling it will work (rotisserie fashion) unless you are willing to rotate the can a long time. I tried dropping a sledge on the charcoal in the bottom of the 2 and 1/2 gallon popcorn can and that didn't work well at all.
Of course using pliers is tedious and I was just making potting soil for potted plants. Pliers do get most of the lumps down to 1/4 inch size with lots of powder produced in the process.
But it takes some pretty good pressure in the right spot to get some of this to break down.
Running over it with a car tire on the asphalt sounds like a good idea but I don't know what I would put it in that wouldn't break.
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