Effects Of Increasing Light Cover And Wall Temperature On Environment,Vegetable Transpiration And Growth In Solar Greenhouse

In order to improve the light and temperature in the solar greenhouse,the light environment in the greenhouse was regulated by different exposure time,and the phase change energy storage material was applied to the wall of the solar greenhouse to improve the temperature,tomato and tender cucumber were used as experimental materials to study the effects of increasing light intensity and wall temperature on transpiration and growth of vegetables in solar greenhouse,the results were as follows:(1)Effect of exposing to cover over light on the greenhouse environment:compared with the control greenhouse,the duration of light in the experimental greenhouse increased by 22%in autumn and 20%in cold winter:For the average temperature,the experimental greenhouse can be increased by 0.4℃ compared with the control greenhouse.For soil temperature,the influence of different uncovering heat preservation time on average soil temperature only varies from 0.2℃ to 0.7℃ after being exposed in the morning and before being covered in the afternoon.(2)Effect of exposing to cover over light on tomato transpiration:test in greenhouse tomato leaf transpiration rate is significantly higher than control greenhouse,sunny leaf stomatal conductance was"bimodal" type curve,two greenhouse tomato leaf stomatal conductance maximum and minimum value of time,and T greenhouse greenhouse peak moved foward one hour than CK.Affecting the leaf transpiration rate to do correlation analysis found that control of greenhouse tomato leaf transpiration rate were very significant positive correlation with leaf,and stomatal conductance was significantly positive correlation,negative correlation with the humidity of the air,and test of greenhouse tomato leaf transpiration rate and stomatal conductance were extremely significant positive correlation,and negatively correlated with the air humidity,ground temperature.The main factor affecting the transpiration rate of the control greenhouse was temperature,and the experimental greenhouse was leaf temperature.(3)Effects of light on tomato growth and development:plant height,leaf length and leaf width of tomato in the experimental greenhouse were slightly higher than those in the control greenhouse,but the differences were not significant.Compared with CK,T treatment increased Vc by 24%,soluble sugar by 41%,soluble solids by 18%,average fruit weight by 13%,average plant yield by 18%,and yield per unit area by 5%.(4)The effect of wall heating on the indoor environment of the greenhouse:the indoor maximum daily temperature of the phase-change coating greenhouse is 1.2℃ lower than that of the ordinary greenhouse on average;As for the soil temperature,the phase-change coating greenhouse can increase by up to 1.3℃ compared with ordinary greenhouse.(5)The effect of wall warming on the transpiration of milk melon:the transpiration rate of phase-change coating greenhouse is significantly higher than that of ordinary greenhouse.Typical weather day,the stomatal conductance of milk melon leaf is inconsistent,sunny day presents"double peak change",cloudy day presents "single peak" change.Correlation analysis on the transpiration rate of milk and cucumber leaves in greenhouse showed that the transpiration rate of ordinary greenhouse was positively correlated with air temperature and stomatal conductance,but negatively correlated with ground temperature,while the transpiration rate of phase-change coating was positively correlated with ground temperature and stomatal conductance,but negatively correlated with air temperature.The main factor affecting the transpiration rate of two greenhouse melon leaves was leaf temperature.(6)The effect of wall warming on the growth and development of daguerreotype:the plant height of daguerreotype in the phase change coating greenhouse was 25%higher than that in the ordinary greenhouse.The difference of other growth indexes was not significant.Under T treatment,VC content and total sugar content of Muskmelon were significantly higher than CK treatment,which increased by 42%and 28%respectively.In a word,the light condition of greenhouse can be improved by early-uncovered and late-covered heat preservation quilt,and the temperature of greenhouse can be improved by adding composite phase change material wall.The study provides a theoretical basis for the environmental regulation of Solar Greenhouse.