Energy optimization and sustainable farming are main goals of the all developed countries. Optimum use of energy is very vital for agricultural productions section. This method in an agricultural product system is the energy consuming in product operations and energy saving in produced crops. In this article, evaluation of energy indices under rain fed farming corn in north of Iran (Guilan province) was investigated. Data were collected from 72 farms by used a face to face questionnaire method during 2011 year in Guilan province. By using of consumed data as inputs and total production as output, and their concern equivalent energy balance, and energy balance indices were calculated. The average yield of corn was found to be 2375 kg/ha and its energy balance equivalent was calculated to be 5290699 MJ/ha. Energy balance efficiency (energy output to input energy ratio) for seed in this study was calculated 1.62, showing the affective use of energy in the agro ecosystems corn production.
