Right on!
Also interesting if you haven't already read it is 'Energy in
Agriculture: Lessons from the Sunshine Farm Project' published by The
Land Institute in November 2002.
<http://www.landinstitute.org/vnews/display.v/ART/2002/09/24/3dbeba6338ac3>
It documents a hands on study of biodiesel production. Pertinent
quote:
It will be a challenge to provide society with considerable energy
from agriculture, let alone food, since the energy returns for
various energy technologies have generally been greater than the
above ratios for mixed crop and livestock farms. Fossil fuels
usually have ratios in the range of 10-30, and solar and wind
technologies, typically 3-10, but renewable liquid or gaseous fuels
from agricultural production, mostly 5 or less [37, 38]. Solar and
wind technologies have greater power densities than energy crops and
thus require less land area [24].
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