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.
Nuke waste with nowhere to go - SOURCE: Katherine Muzik PHD (firstname.lastname@example.org) SUBHEAD: Nevada says "Not in My Back Yard" on Trump revival of Yucca Mountain nuclear waste dump. By Julia...
22 hours ago