Effects Of LED Green Light On Growth And Quality Of Vegetable

The experiment was conducted in a fully enclosed artificial light plant factory.White-green LED light source with adjustable light intensity and quality was used to provide different light environment for plants.The lettuce,tomato and potato with large cultivation amount of leafy vegetables,fruit vegetables and rhizome vegetables were used as materials,to explore the effects of green light on the growth and development of lettuce,tomato and potato,in order to improve the theoretical study of interaction between green light and crop growth and metabolism,and to provide a theoretical basis for high yield and quality cultivation of lettuce,seedling of tomato and artificial light environment regulation of rapid propagation of potato.Further clarify the role of green light in vegetable growth and development.The main conclusions of this study are as follows:(1)The background white light with the intensity of 200 μmol·m-2·s-1 was used as control,and the white light was replaced by green light with different intensity(50,100,150 μmol·m-2·s-1)and to irradiate the lettuce.The results showed that the overground dry weight,chlorophyll,soluble sugar and vitamin C content of lettuce were significantly increased(P<0.05),and nitrate content was significantly decreased under 50 μmol·m-2·s-1 green light replaced-light treatment,which was the recommended light treatment in this experiment range.(2)The background white light with the intensity of 200 μmol·m-2·s-1 was used as control,and the white light was supplemented or replaced by green light with different intensity(50,100,150,200μmol·m-2·s-1)and to irradiate the plant of tomato.The results showed that the dry and fresh weight of tomato plants were the highest under the green light supplement treatment of 50 μmol·m-2·s-1,chlorophyll and carotenoid contents were the highest under the green light supplement treatment of 150 μmol·m-2·s-1and green replaced-light treatment of 200 μmol·m-2·s-1.The content of crude fiber and total soluble sugar in tomato plants were increased by green light supplementation treatment of 50 μmol·m-2·s-1 and all green replaced-light treatments.Under the two light supply modes,the total nitrogen content was the highest under the green light intensity of 150 μmol·m-2·s-1.The activity of CAT in tomato leaves both increased under all green light supplementation treatments,at the same time,SOD activity was the highest in tomato leavesunder 100 μmol·m-2·s-1 green light supplementation treatments.(3)The background white light with the intensity of 200 μmol·m-2·s-1 was used as control,and the white light was replaced by green light with different intensity(50,100,150,200 μmol·m-2·s-1)and to irradiate the plant of potato.The results showed that,compared with the control,all green light replaced-light treatments increased the Photosynthetic Pigments Content of potato leaves in varying degrees,and reached the highest level under the green replaced-light treatment of 150 μmol·m-2·s-1.The number of potatoes per plant,the number of potatoes available per plant and the contents of dry matter,starch and total soluble sugar in micro-potatoes were higher than those in the control,and the content of raw sugar was significantly lower than that in the control(P<0.05).