AbstractThis study was carried out to investigate the energy consumption and cost of two methods of onion cropping consisting of seed planting or seedling transplantation. Plans to reduce the level of energy consumption and costs are proposed too. To determine input and output energy, a questionnaire was designed to include the types and amounts of applied inputs at different stages of crop production. The results indicated that the output/input energy ratios for seed planting and seedling transplantation were 0.81 and 0.93, respectively. Furthermore, for these two methods, the net energy gain was -56941 and -18651 MJ/ha, and energy productivity was 0.24 and 0.29 kg/MJ, respectively. Calculations of energy intensity revealed that to produce one kilogram of onion, 4.2 and 3.46 MJ energy were consumed for seed planting and seedling transplantation, respectively, indicating a 17.6% energy saving with the latter method. In 2013, labor costs constituted the major portion of onion production costs as they accounted for 41.9 and 52.44% for seed planting and seedling transplantation costs, respectively. Deploying modern irrigation systems, appropriate planting and harvesting machines, and following the recommendations of agricultural experts on fertilizers, pesticides and seeding rates would substantially reduce energy consumption and the cost of onion production
Keywords: Energy Index, Input consumption, Onion, Yield.