An analytical method to survey the energy input-output and emissions of greenhouse gases from Wheat and Tomato farms in Iran

This study survived the energy use patterns and energy input-output of wheat and tomato productions in Isfahan province of Iran. The face-to-face questionnaire method was used to collect the data from 75 and 35 farmers for wheat and tomato, respectively. The results showed that total energy input for wheat and tomato production was to 46108and 115894 MJha -1 , respectively. Among all inputs involved, fertilizer had the highest energy value per hectare for wheat; furthermore, diesel fuel had the highest share of total energy consumption for tomato production. The value of energy ratio for cultivating whea t and tomato productions were calculated at 0.95 and 0.75, respectively. The ratio of renewable energy within the total energy in all productions is very low. The share of non -renewable energy for wheat and tomato production was 80% and 85%, respectively. The results of CO2 emission analyzes showed that the total amount of CO2 emission for wheat and tomato production was 1.9 and 4.7 tonesha -1 , respectively. In the research area, use of further energy made some environmental damages such as global warming, nutrient loading and pesticide pollution. Therefore, there is a need to develop a new policy to force producers to use all inputs on time and enough undertake more energy efficient practices.