Research On Model Construction And Software Development Of Facility Tomato Growth And Development

In recent years,the rapid development of Chinese facilities horticulture,facilities tomato cultivation area proportion is increasing,in the actual production management and fruit yield per unit area,China and the Netherlands compared with other countries there is still a gap.With the rapid development of computer technology,based on the planting conditions of facility tomato in China,domestic research on crop model began to develop to digital.How to construct a facility crop simulation model with high accuracy and wide range of application instead of the previous management mode based on manual experience is an urgent problem for the researchers in this research direction to deal with.In this paper,the radiation heat product was used as the independent variable to construct the appearance shape and material accumulation distribution model of facility tomato.The model was composed of four sub-models:appearance shape simulation model of facility tomato,dry matter accumulation distribution index simulation model of facility tomato,fresh weight accumulation distribution simulation model of facility tomato and individual plant yield simulation model of facility tomato.At the same time,the software of this model is developed based on Lab VIEW,and the practical application effects of two types of greenhouse are verified.The main test results are as follows:（1）On the basis of the tomato development model of effective accumulated temperature method,the tomato development model of four kinds of function calculation of physiological development time,the equivalent accumulated temperature method and the clock model method of seven classical tomato physiological development models,combined with the actual planting data to optimize the tomato physiological development model more suitable for this region.Combined with the actual data and practical application effect of asymmetric thermal insulation plastic greenhouse and solar greenhouse,it was found that the model based on physiological development time（linear piecewise function）could reflect the influence of temperature factors on tomato growth and development more intuitively and effectively,and the simulation error was within 2～6days,which was suitable for building a wide range of applicability of facility tomato growth model.（2）The appearance and morphology model of facility tomato was constructed based on radiative heat accumulation.The coefficients R²and RMSE of the model were 0.728 6and 6.81 cm,respectively,for the simulation results of tomato root length,and 0.594 2 and1.1 mm,respectively,for the simulation results of stem diameter.The coefficients R²and RMSE of plant height simulation results were 0.9074 and 13.66 cm,respectively.The coefficients R²and RMSE of leaf area index LAI simulation results were 0.743 1 and 1.03m²·m^-2.The model has a good simulation result for different greenhouse tomato plant height.（3）The material accumulation and distribution model of facility tomato was established based on radiation heat deposition.Combined with the experimental data of different stubble,it was verified that the model could accurately simulate and predict the changes of tomato dry matter mass accumulation,fresh matter mass and yield per plant:The coefficients of R²and RMSE were 0.854 1～0.975 1 and 2.87～6.98 g·plant^-1,respectively.The coefficients R²and RMSE of whole plant,shoot and fruit fresh mass accumulation ranged from 0.887 2 to 0.905 0,and 109.83 to 171.16 g·plant^-1.The determination coefficient R²and RMSE were 0.967 5 and 99.82 g respectively.Combined with the two classical tomato growth and development models,the RMSE simulated by TOMGRO for tomato fruit in solar greenhouse was 4.362 5g,and the RMSE for plant tomato material accumulation and distribution model was 4.191 6 g.The RMSE of TOMGRO was 5.179 9 g for the tomato fruit simulation of the asymmetric insulation plastic greenhouse,and 6.795 8 g for the material accumulation distribution model of the facility tomato.It was analyzed that the model should be further optimized and improved in terms of the quality of dried fruit and fresh fruit combined with the mechanism model.（3）Based on Lab VIEW,the software development of the appearance shape of facility tomato and the accumulation and distribution model of facility tomato substance was realized.The software system updated the local database,realized the data reading,data algorithm processing,tomato simulation data visualization and other application effects.The practicability of the software system was tested by combining the real-time weighing equipment data of solar greenhouse and multi-block sawtooth plastic film greenhouse in actual production.The correlation coefficients R of the predicted and measured fresh mass of the above-ground part were 0.945 and 0.980,respectively.The root mean square errors（RMSE）were 49.52 g and 59.70 g,respectively.The results showed that the software system could predict tomato growth changes online and in real time.In summary,the facility tomato growth model with higher applicability was selected from seven classical physiological development models of tomato,and the appearance and material accumulation and distribution models of facility tomato were constructed by taking the radiation product as the variable.The corresponding software system was developed based on Lab VIEW,which could realize the real-time prediction and simulation of facility tomato growth.It is of great significance to provide data basis for the development of modern agricultural automation in the future and improve the economic yield of facility tomato by combining with greenhouse environmental control system.