Effects Of LED Light Source On Growth Characteristics And Nutritional Quality Of Schizonepeta In Plant Factory

Over the past few years,as the world’s population has grown rapidly,leading to a steady rise in demand,while the available arable land area is decreasing year by year,using limited arable land to meet people’s demand for healthy food has become an urgent problem.The plant factory is the advanced stage of modern facility agriculture.plant factories are not restricted by natural conditions and can achieve annual continuous production of crops through high-precision environmental control means inside the facilities,which has the advantages of high quality,high yield and no pollution.Schizonepeta is rich in nutritional value and medicinal value,which is a dual-use vegetable with higher economic benefits than conventional crops.However,the traditional planting mode leads to the accumulation of pesticide residues and nitrate in schizonepeta.To improve the food safety and yield of schizonepeta,Schizonepeta was used as experimental material in this study.To explore the effects of different light conditions on the growth characteristics and nutritional quality of schizonepeta in plant factories,and to provide theoretical basis for the establishment of high-yield,high-quality and energy-saving light quality and light intensity combination in plant factories.The main conclusions are as follows:（1）Increasing the proportion of red light in the light quality can increase the contents of chlorophyll,soluble protein and soluble sugar,but reduce the content of vitamin C.Red and blue mixed light can reduce the content of nitrate in schizonetin.The chlorophyll content of schizonetin is the highest and the vitamin C content is the lowest in the R:B=9:1light treatment group,and the soluble sugar content of schizonetin is the highest in the R:B=7:1 light treatment group.The soluble protein content was the highest and the nitrate content was the lowest in the R:B=5:1 light treatment group.At the same time,red light can significantly promote the vertical and transverse growth of the main stem of Schizonepeta.（2）The biomass accumulation of schizonepeta was positively correlated with light intensity.Appropriately increasing light intensity was beneficial to promoting the contents of soluble protein,vitamin C and soluble sugar,and at the same time was beneficial to reducing nitrate content.However,chlorophyll content increased first and then decreased with the increase of light intensity.The contents of soluble protein,vitamin C and soluble sugar in250μmol·m^-2·s^-1light intensity treatment group were the highest,the content of chlorophyll in150μmol·m^-2·s^-1light intensity treatment group was the highest,and the content of nitrate in200μmol·m^-2·s^-1light intensity treatment group was the lowest.However,too high or too low light intensity had adverse effects on the growth of Schizonepeta.The plant height,leaf width,stem diameter and dry/fresh weight ratio of schizonepeta growing underμmol·m^-2·s^-1light intensity were higher than those growing under 250μmol·m^-2·s^-1light intensity150μmol·m^-2·s^-1.In addition,all indexes were significantly better than those of Schizonepeta plants growing under 100μmol·m^-2·s^-1.（3）Light quality and light intensity are important light influencing factors in the growth and development of Schizonepeta.According to the results of this experiment,we can set the light quality as R:B=5:1 and light intensity as 200μmol·m^-2·s^-1as the best light source environment for the growth and development of schizonepeta in plant factories,which can significantly improve the yield and quality of schizonepeta.For artificial light factory cultivating fineleaf schizonepeta herb plants and perfect light source to provide the reference.