The main goal of management of agricultural ecosystems is to maximize the energy flow and human's artificial inputs. This investigation was conducted to evaluate the economic efficiency and crop energy of dry farming of barley ( Hordeum vulgare) in Azarbayejan-e-Sharqi province, Iran. Information and data were obtained from barley farmers and Jihad-e-Agriculture organization of the province. In this study, routine scientific methods were used to change input and output data to their equal quantities and then energy efficiency (ratio of produced energy to consumed energy) was calculated. The rate of inputs applied in these fields was 5923.79 kcal/ha and the rate of produced energy was computed 7644.16 kcal/ha. The rate of energy efficiency (the ratio of output/input) was 1.22 for the crop. Results revealed that most used energy in barley cultivation belonged to fertilizers and machinery energy, so consumption of the energy can be reduced and the energy efficiency can be increased for correct management.
