Many research have been carried out on the positive effects of high voltage of electric fields on yield and germination power of seed. Electric fields with physiologic changes in seed that resulting in faster water absorption and respiration as well as intensifying of photosynthesis of germination result increase the biological capacities of seed. It has been believed that exposing biological process, including free radicals, activities stimulation of proteins and enzymes increase seed power. The effect of electric fields on germination percentage, germination rate as well as, height and dry weight of seedling on onion seed was studied, for AzarShahr variety, in this research. The onion seeds samples are exposed to the electric fields of 2, 4, 9 and 14 kV/cm for 15, 45, 80 and 150 s. The treated seed was transferred to the lab immediately and its growth characteristics were studied in this experiment. The result of experiment showed that the maximum increase in germination percentage and seedling height was 9kV/cm in field intensity. Maximum increases in germination rate and dry weight of seedling was observed in the field intensity of 2kV/cm. The maximum increase in reminded characteristics was obtained in time period of 15- 45s

Keywords