Study On The Regulate Of LED Light On Growth Regulation Of Tomato Seedlings

?Objective?The light environment is one of the important physical environmental factors that are indispensable for plant growth and development.In some northern regions,due to the haze and other environmental conditions,the facility crops inevitably grow in low light stress.Tomato is a hi-light crop,in order to meet the needs of the light of the seedling stage in the low light stress application of a new artificial light source LED plant fill light,to study the effect of different LED light patterns on the growth of tomato seedlings,the establishment of a thermal product scale Tomato seedlings grow leaf area and dry matter simulation models in order to reduce energy consumption for tomato seedling production and provide theoretical and technical support for accurate,green,sustainable production.?Method?When the variety is the time for the research of the tomato,it is divided into three treatments according to the fill light mode,and the non-continuous light supplement of 8h is extended from 07:00 to 11:00 and 19:00 to 23:00.(T1)and 12 h supplemental daylight fill light(T2)from 07:00 to 19:00,with no light fill as a control(CK).? Result ? With tomato seedlings treated with LED light,the leaf area was significantly increased,about 30%;the plant height and stem diameter were also significantly increased;dry matter accumulation was significantly increased,the accumulation rate was significantly increased,and the dry matter distribution rate in each organ was reduced.Significant changes;net photosynthetic rate,transpiration rate,stomatal conductance,and chlorophyll fluorescence of tomato seedlings were all improved to varying degrees;roots were used as organs for plants to absorb nutrients and water,in this experiment,the roots of tomato seedlings were treated with fill light.The configuration has been significantly improved,and the root activity has increased significantly,which has increased the ability of seedlings to absorb nutrients and water.As the main indicator of seedling quality,the seedling index of tomato seedlings under the light-filling lamp treatment is significantly increased.In the production of facility crops,because of the high cost and energy consumption of LED fill light,it is not widely used.Therefore,it is very important to reduce the energy consumption and reduce the cost as much as possible under the premise of ensuring the light fill effect.In this experiment,8h non-continuous light supplements:07:00-11:00,19:00-23:00 extend the time for supplementing light in the morning and night,breaking darkness for 2-4 hours,and 12 hours for continuous light compensation.07:00-19: Compared with the supplemental sunlight supplementation method of 00,the leaf area,dry matter accumulation,net photosynthetic rate,chlorophyll fluorescence,root architecture,strong seedling index,etc.have all increased significantly in different degrees,prolonging the time for supplementing light in the morning and evening and breaking the darkness 2-4.The hour light supplement method ensures the light-filling effect of tomato seedlings,reduces the light-filling time,reduces energy consumption,and is optimal for treatment.?Conclusion?In the cultivation of tomato seedlings,the use of LED plant fill light under low light stress conditions can significantly improve the growth quality of seedlings,thereby cultivating strong seedlings,laying a good foundation for later cultivation and production;under the same light-filling conditions,prolonging the morning and evening supplements The duration of light breaks the dark 2-4 hours light-filling mode to ensure the light-filling effect of tomato seedlings,while reducing the length of fill light,reducing energy consumption,for the optimal treatment;the results of this study show that the use of thermal product as a model scale To predict the growth of tomato leaf area and dry matter in the greenhouse,a model based on thermal energy product was established.Compared with the accumulative temperature method and the specific leaf area model,the stability of the model was effectively avoided,the parameters were not easily obtained,and the solar system was not considered.The drawbacks and limitations brought about by the influence of radiation and other factors,and the model with the product of thermal radiation as the dimension not only improves the simulation accuracy of the leaf area,but also improves the simulation prediction accuracy of dry matter production,and is more practical and mechanism-based.