Supplementing Light Effects of Light Emitting Diodes (LEDs) on Vegetable Seedling
To solve the missing light of vegetable seedling in winter and spring in South China region, the study investigated the effects of supplementary lighting of emitting diodes(LEDs) on the growth of vegetable seedling by using different proportions of red and blue combination LED(red ∶ blue=7 ∶ 3, 7R3B; red ∶ blue=8 ∶ 2, 8R2B; red ∶blue=9 ∶ 1, 9R1B). Natural light was as the control. The results showed that red and blue LEDs were effective in promoting growth of bitter, cowpea, eggplant and chili seedlings. The fresh weight, dry weight of underground part, chlorophyll content and root activity of bitter seedlings were significantly promoted by using certain proportion of red and blue combination LED; Dry weight of underground part, chlorophyll content and root activity of cowpea seedlings were also significantly increased; All detection morphological and physiological indices of chili and eggplant seedling were significantly promoted; The most optimum light quality of chili seedling was9R1 B. The most optimum light quality of eggplant seedling was 8R2 B.