Investigation on oriental melon was carried out for 30 minutes starting at 7 PM every day from March 21 to May 24 to find out the effect of light emitting diode on seedling quality, grafting, growth and flowering of oriental melon. According to the result of the investigation, plant height was longer in Blue, Infrared, Red+Blue and Red treatment and leaf number was higher in Blue, Red+Blue and Infrared treatment than those of control. No big difference was identified between control and Yellow, Green, Ultraviolet treatments. Grafting rate was high in Green, Red+Blue and Green treatment. The number of flower evef}' week in control was nine, the number was almost 1 higher in White and Ultraviolet A treatments, but it was 1 to 4 lower in the rest of treatments. The number of female flowers of control was 10, however, it was 21 in Infrared treatment, 17 in White, 15 in Ultraviolet, 13 in Red+lnfrared, 12 in Blue and Red+Blue, 11 in Yellow and 8 in Green.

• Shin, Y. S(Gyeongsangbuk-do Agricultural Research & Extension Services, Daegu, 702-708, Korea)
• Lim, Y. S.(Gyeongsangbuk-do Agricultural Research & Extension Services, Daegu, 702-708, Korea)
• Lee, M. J.(Gyeongsangbuk-do Agricultural Research & Extension Services, Daegu, 702-708, Korea)
• Han, Y. Y.(Gyeongsangbuk-do Agricultural Research & Extension Services, Daegu, 702-708, Korea)
• Park, S. D.(Gyeongsangbuk-do Agricultural Research & Extension Services, Daegu, 702-708, Korea)
• Chae, J. H.(Gyeongsangbuk-do Agricultural Research & Extension Services, Daegu, 702-708, Korea)