Effects of LED Red and Blue Compound Light on Growth and Quality of Pea Sprouts

In order to study effects of different light quality on growth and quality of pea sprouts，“Green Valley Ma Pea No.2”was cultivated on seedling paper.The pea sprouts were treated with 10 treatments，white light as control，red light∶blue light=3∶1，red light∶blue light=4∶1，red light∶blue light=5∶1，red light∶blue light=9∶1，red light∶blue light=7∶3，red light∶green light∶blue light=6∶2∶1，red light∶green light∶blue light=9∶1∶0，red light∶green light∶blue light=8∶1∶1，red light∶green light∶blue light=7∶1∶2.On the 8th day，growth and quality indexes of pea sprouts were determined in order to screen the optimum light quality of pea sprouts.Results showed that，plant height of red light∶green light∶blue light=9∶1∶0 was the highest，followed by red light∶blue light=5∶1 and 3∶1；the plant with red light∶blue light=3∶1 had the thickest stem and the longest root length.The plant with red light∶green light∶blue light=9∶1∶0 had the highest above ground fresh weight，economic yield and edible rate，followed by red light∶blue light=5∶1.The plant with red light∶blue light=5∶1 had the highest fresh weight，dry weight and biological yield，and the contents of chlorophyll a，chlorophyll b，chlorophyll a+b and carotenoid were significantly higher than those of other treatments.To sum up，treatment 3（red light∶blue light=5∶1）could promote plant growth，increase biological yield and effectively increase accumulation of plant dry matter content.Therefore，red light∶blue light=5∶1 could be used as the light quality for growth of pea sprouts.