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Pistachio is considered as an important agricultural commodity in Iran and ranks top amongst all exported agricultural products. Wide and inefficient use of energy in agriculture sector is leading to waste of energy and environmental problems. Conducting an overall energy survey and economic analysis of pistachio production can provide useful information for improving energy efficiency. In this paper, Data Envelopment Analysis (DEA) technique was applied for pistachio producers to analyze the Energy inputs-yield relationship. The data was collected from 70 producer in the summer of 2013 using random sampling. The results revealed that the total energy input for pistachio production was 129411.8 MJ ha–1. Energy use efficiency was 0.41, energy productivity was 0.03 (〖Kg Mj〗^(-1)), specific energy 29.41 (〖Mj Kg〗^(-1)) and Net energy -77481.8 (〖Mj h〗^(-1)) were estimated. Technical, pure technical and scale efficiencies were calculated. The VRS analysis showed that only 33 of DMUs were efficient. The results revealed that production of pistachios in Yazd Province, under current management practices, are not energy efficient and efforts should be made to improve energy use efficiency and DEA is an effective tool to analyze and benchmark productive efficiency of farms.

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The use of agricultural machinery, fuel, fertilizers, and pesticides render agriculture dependent on energy and have negative environmental effects on water, air and land. Therefore, it is necessary to study the process of energy consumption for producting the different products and take the necessary measures to increase the efficiency and decrease the environmental effect of these inputs. In this study, we calculate the pattern of energy consumption in dryland rape, using energy ratio, energy efficiency, energy intensity and net energy addition and the environmental effects in three districts of Ilam province using the life cycle evaluation. In order to conduct the study, we obtained  the required data by using the questionnaire method to interview farmers and related departments. The results of this study showed that the average ratio of the energy for the dryland rape production in Chardavol, Darrehshahr , and Abdanan districts was respectivelyt 7.91,7.67, and 6.91. Based on the results of the life cycle assessment, diesel fuel had the maximum effect on reduction of inorganic sources, ozone layer depletion and water contanimation. Direct emissions had the greatest impact on acidification, river pollution, global warming and human poisoning.