In a handful of healthy soil there are more micro organisms than there are humans on earth.
In case you did not read that here it is again; In a handful of healthy soil there are more micro organisms than there are humans on earth.
I would highly recommend reading this book that gives an excellent insight into these micro organisms. Teaming with Microbes by Jeff Lowenfels and Wayne Lewis.
Organic and biodynamic farmers feed these microbes through compost, compost extracts, crop rotation and high density grazing.
Conventional farmers use conventional fertilizers to “feed” their plants, 6 tons of which was used in July 2011 to blow up the Norwegian Prime Minister’s Office.
Soil microbes can be exploded too.