Cucumber Growth Model Based On Real-time Weight With The Substrate Growth-bag In Solar Greenhouse

Solar greenhouse is a kind of low-energy and high-efficiency vegetable production facility unique to China.However,in actual production,due to the simple structure of China's solar greenhouse and imperfect supporting equipment,it is not suitable for high temperature and strong light in summer and low temperature and low light in winter.Growth under the environment,the crop growth model driven by large greenhouse environmental factors abroad is difficult to apply in solar greenhouses.Therefore,in this study,Cucuy Jinyou '30' was used as the experimental material,and the real-time measurement system was used to study the growth model?RWM?of the greenhouse in the solar greenhouse based on real-time weight,and driven by environmental factors under suitable and sub-optimal conditions.The model?EDM?was compared to simulate crop growth under sub-optimal environmental conditions in a solar greenhouse,providing theoretical and technical guidance for the precise management of cucumbers in solar greenhouses.The main findings are as follows:1.The daily growth of fresh weight on cucumber plants is the real-time weight at a fixed time on the second day minus the corresponding time on the first day.By comparing the daily growth of cucumber plants at four time points: 00:00,05:00,06:00,and 08:00,the daily growth of spring and autumn rafts calculated at 00:00 is the most accurate,and the coefficient of determination R² is 0.92 and 0.91.Therefore,this study used 00:00 to calculate the daily growth.The daily growth of cucumber plants in spring and autumn sorghum was between 20-120 g and 20-70 g,respectively.The growth of cucumber plants was significantly greater than that of autumn carp.2.The effects of environmental factors?light intensity,greenhouse temperature and radiant heat?on the daily growth of fresh weight of cucumber plants were analyzed by analyzing the environmental factors?light intensity,greenhouse temperature and radiant heat product?in the solar greenhouse,indicating the growth of cucumber plants on the day after the environmental factors of the previous day.That is,the day before,the light intensity is high,the greenhouse temperature is high,and the radiant heat product is large,and the growth amount is large after the day.On the contrary,the environmental conditions on the previous day were poor,and the amount of growth on the latter day was small.3.Through the comparative analysis of the actual weight of plant on the ground,RWM weight and EDM simulated weight,the results showed that the daily growth of fresh weight of spring and autumn sorghum plants was in a state of fluctuation,and the accumulated freshweight accorded with the “S” growth curve.The daily growth of the plant,the RWM value and the EDM value of the spring raft were close to the actual value under the suitable conditions;the real-time value and the simulated value were 36 g apart under the sub-optimal condition.The difference between the two was large,but the real-time value was close to Actual value.The real-time value and the simulated value are close to the actual value under suitable conditions.Under the sub-optimal condition,the real-time value and the simulated value are different by 29 g,and the difference between the two is large,but the real-time value is close to the actual value.4.The relationship between fresh weight and dry weight of cucumber organs in spring and autumn sorghum was established.The model accorded with linear relationship,and the determination coefficient R² was above 0.9.indicating that the curve fitting degree was high.The relationship between fresh weight distribution index and growth and development time of cucumber organs was established by curve fitting method.The fresh weight index and growth and development time of cucumber organs under suitable conditions were as follows:stem: y = 20.85x^-0.947;leaf: y = 376.63x^-1.14;fruit: y =-0.000005x²+0.0064x-1.15.The decision coefficients R² are 0.89,0.81,and 0.89,respectively.Where y is the distribution index of each organ and x is the accumulated temperature.The models of fresh weight index and growth time of cucumber organs under Sub-suitable conditions were: stem: y = 0.82x^-0.42;leaf: y =15.40x^-0.62;fruit: y =-0.000001x²+0.0018x^-0.08.The decision coefficients R² are 0.86,0.81,and 0.87,respectively.The fresh weight distribution index of each organ was verified.Under suitable conditions,the RMSE of the stem,leaf and fruit distribution index models were 0.14,0.14 and 0.68,respectively.The RMSE of the distribution index model of stem,leaf and fruit under Sub-suitable conditions were 0.02,0.01 and 0.11,respectively.It can be concluded that the distribution index model of each organ of spring can be well applied to autumn,and the RMSE under Sub-suitable conditions is lower than that under suitable conditions.5.Established a cucumber fruit yield model: Y = ? DW * distribution index,where Y:cucumber fruit daily growth?g?,? DW: cucumber plant daily growth?g?.The daily growth of cucumber fruit in spring is between 3 and 80 g,which varies greatly.The growth of autumn fruit is between 10 and 30 g.The daily total growth of cucumber fruit in spring is obviously higher than that in autumn.By comparing the daily growth of RWM and EDM fruit simulation results,the results showed that the simulations of RWM and EDM for the daily increment of spring sorghum were 9.66 and 7.11,respectively,under suitable conditions,and the simulation of RWM and EDM for the daily increment of autumn sorghum fruit.They are7.11 and 7.50 respectively.It is indicated that both models can be applied under suitableconditions;the simulations of RWM and EDM of spring germination are 4.99 and 14.50 respectively under suboptimal conditions,and the simulated values of RWM and EDM for autumn germination are respectively 7.50 and 10.46.It is shown that the model based on real-time weight is more accurate under suboptimal conditions.In summary: This test uses the real-time weighing method to determine the most accurate daily growth of cucumber plants according to 00:00.Under the appropriate conditions,the real-time and simulated values of cucumber plant growth were close to the actual values.Under the sub-optimal conditions,the real-time value and the actual value were close,and the simulated value and the actual value were quite different.The fresh weight distribution index model of cucumber plant shoots was established by curve fitting method and verified to predict the yield of cucumber.