The importance of soil for agriculture

The New York Times has published an interesting article on the importance of soil for agriculture and what resides in the soil — the microbes, fungi, nematodes, mites that make up a complex web of interrelationships. http://www.nytimes.com/2013/05/12/opinion/sunday/the-hidden-world-of-soil-under-our-feet.html?hp&_r=1&pagewanted=all&