Here's an excellent current research piece on biochar production. A little weighty but well worth one's time.
This describes the technique I've found to work best on my site.
Hawaii's feral chicken "problem" - SUBHEAD: What came first? The chicken or the Whole Foods parking lot in Kailua on Big Island. By Kristen Downey on 25 May 2017 for Civil Beat - ( http:/...
38 minutes ago