"The yields obtained in organic farming were comparable with the yields from conventional production. The research results revealed that the energy input use on organic production was 52.5% lower than that of conventional production. Energy balance makes it possible to compare different farming systems in terms of energy efficiency. More energy from embedded energy units was produced in the organic farming system (about 4.4% on average).”
M. Klimeková and Z. Lehocká, “Comparison of organic and conventional farming system in term of energy efficiency,” (Wissenschaftstagung Ökologischer Landbau, Universität Hohenheim, Stuttgart, Deutschland, 2007), accessed October 29, 2014, http://orgprints.org/9841/.