promotion of seed germination and seedling growth of tomato by magnetic field and hydropriming treatments

study of magnetic field and seed hydropriming effects on tomato seed germination was done in laboratory of ferdowsi university of mashhad, iran. the experiment was as factorial experiment based on randomized completely design, which was including two level of hydropriming (use of dry seed and soaked seed in distilled water for five hours) and eight level of magnetic field (pretreatment of seeds in 15 and 25 mili tesla magnetic field for 5, 15 and 25 minutes, permanent magnetic field with intensity 3 mt and control). seed hydropriming significantly reduced mean germination time (mgt). also it increased radicle length from 6.68 to 7.59 cm (14 percent) in comparison to dry seed. seed hydropriming led to increasing shoot length, seedling length and vigour index by 7, 12 and 13 percentages in comparison to dry seed, respectively. exposure of seeds in 3 mt permanent magnetic field and 25 mt for 5 minutes increased root length by 29 and 25 percentages in comparison to control. these treatments indicated the highest shoot length, seedling length and vigour index.