Michael Martin Melendrez talks about soil micro-organisms. The difference between aerobic and anaerobic bacteria, facultative anaerobes, hypervirulency and its causes an then he relates these to possible problems with compost 'tea', food safety, etc..
Michael Melendrez explains the source of humus and its role in healthy soil
Michael Melendrez digs deeper into lifeforms that create healthy soil
Michael Melendrez talks about the role of Mycorrhiza: endo/ecto.