There is a good article entitled "Oil and Food: A Rising Security Challenge" by Danielle Murray
at the Earth Policy Institute. From the article and an accompanying page with wonderful graphs (and sources) comes this graphic that shows where energy is used in ag. It's numbers are similar
to a previous post on this issue.
Primary: M. Heller and G. Keoleian, Life-Cycle Based Sustainability Indicators for Assessment of the U.S. Food System, Ann Arbor, MI: Center for Sustainable Systems, University of Michigan, 2000, p. 41
Secondary: Earth Policy Institute, Oil and Food: A Rising Security Challenge - DATA, May 9, 2005