What people call organic farming is ideologically descended from Theosophy (http://en.wikipedia.org/wiki/Rudolf_Steiner), and more generally German nature mysticism c. 1900. And it is a deeply conservative ideology--arising from intuitions about purity and resistant to evidence and innovation.

There's a lot of room for public critiques of modern farming technology. Unfortunately, "organic" has occupied most of that space, and that hurts everyone.