Volume 20

The effect of UV-B exposure on the seedling vigor of mung beans (Vigna radiata) was studied. Seeds were exposed to UV-B light for times of 0, 1, 2, 4, 8, 12, and 16 hours, and were then left to germinate for a total of 48 hours, including exposure time. The length of the seedling radicle and the percentage of seeds that germinated were measured. It was found that seedling vigor increased at two hours of UV-B exposure, with a gradual decrease in seedling vigor after two hours. There was no significant difference in the seedling vigor for the durations of 1, 4, and 8 hours of UV-B light exposure.