I had the pleasure of attending Dr. Elaine Ingham's soil biology classes at Rodale Institute last spring. If you have the time to listen, this is an interview that she did on Sunday. The interview was the first half hour of the show, it is approx. 30 minutes long.
http://www.kgnu.org/tributaries/5/12/2013
The point that she kept emphasizing during the classes is that our soils contain everything that a plant needs to grow. We don't need to be adding any extra minerals, etc. to our soil for plant growth. The microbes will mine every mineral that a plant needs and give it to the plant in the exact quantities that the plant needs. We need the microbes not the additives but chemical companies want us to be dependent on their products. Without the soil microbes present in our soil, we are dependent on their products. We don't have to be.
