... heat of the output products and the total sequestered energy in the production factors. Energy productivity is the amount of a product obtained per unit of input energy. Energy output and net energy ... Department of Agricultural Machinery Engineering, Faculty of Agricultural Engineering and Technology, University of Tehran, Karaj, Iran. Abstract Efficient use of energy in agriculture is one of ... that, in all of the farm groups, the rate of direct energy was greater than that of indirect energy and the contribution of non-renewable energy forms was higher than that of renewable energy consumption....