I missed the beginning, but still saw a good chunk of this documentary last night on OPB. It's called Dirt! The Movie, and I think soils as well as organic farming & gardening students will find it really interesting.
The OPB Independent Lens site:
http://www.pbs.org/independentlens/dirt-the-movie/film.html
And the official movie site:
http://dirtthemovie.org/pages/all-about-dirt