Evaluation of Wheat Energy Balance Under Rain fed Farming in Kermanshah

One way to evaluation of sustainable developing in agriculture is using of energy flow method. 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 wheat energy balance under rain fed farming in Kermanshah is investigated. By using of consumed data as inputs and total production as output، and their concern equivalent energy، energy efficiency is calculated. Energy value of used inputs of this type cultivation was 6130900 kcal/ha and output (production) energy of value of wheat grain yield and straw were 5018000 kcal/ha and 4316000 kcal/ha، respectively. Also، energy efficiency value was 1. 521 and that of grain and straw separately was 0. 818 and 0. 703، respectively. Results showed that the highest input energy was due to machinery using، nitrogen fertilizer and fuel; and lowest ones were related to human muscle power and herbicide. Using of combination machines، doing timely required repairs and services for tractors and representing a fit crop rotation are suggested to decrease energy consuming for dry farming wheat in Kermanshah.