Development Of A Real-time Monitoring Platform For Microclimate Suitability And Growth Indicators Of Greenhouse Tomato Growth

In recent years,with the wide application of modern information technology in the field of facility agriculture,the deep integration of modern information technology with the planting industry in facility agriculture to achieve an all-round upgrade of agricultural production,including information perception,quantitative decision-making and personalized services,is an important guarantee for the development of facility agriculture.At present,the application level of modern information technology in traditional facility tomato cultivation is low,and growers generally rely on farming experience to determine the suitability of greenhouse microclimate for tomato growth,and judge the growth condition of tomatoes through manual inspection,which costs a lot of labor.In order to improve the level of modern information technology application in facility tomato cultivation and to analyze agricultural data intelligently,this study was conducted for quantitative analysis of microclimate suitability for greenhouse tomato growth and tomato growth index simulation model to establish a digital platform for growers to evaluate microclimate suitability and monitor tomato growth index in real time,as follows:（1）A greenhouse microclimate and tomato above-ground weight monitoring system with real-time data aggregation was developed and installed.The weight monitoring system allows long-term,stable and non-destructive monitoring of the above-ground weight of tomato plants,and a touch screen configuration display interface was written to realize a centralized display of each data.（2）A spring and autumn crop test was conducted in an asymmetric insulated plastic greenhouse using tomato as the test material.The results showed that the suitability index calculation method identified 75%of the microclimate suitability with the manual empirical judgment,and the fit and accuracy of the growth rate simulation were good,the simulated and measured values of relative growth rate at seedling stage R²=0.858,RMSE=0.048 d^-1,and the simulated and measured values of absolute growth rate at flowering and fruiting stage R²=0.789,RMSE=0.877 g·d^-1（3）Tomato plant height and leaf area index simulation model construction experiments were carried out in insulated plastic greenhouses and heliostats,and real-time weight-based tomato plant height and leaf area index simulation model construction experiments were carried out in heliostats and continuous plastic greenhouses using tomato as test material.The results showed that the correlation between tomato stem fresh weight and plant height and leaf fresh weight and leaf area was highly significant（P<0.01）,and the formulae for calculating the above-ground stem and leaf weight distribution coefficients of tomato were constructed with R²of 0.995 and 0.996,respectively,which were well fitted and could calculate the distribution coefficients of tomato stems and leaves at different fertility stages more accurately.The accuracy of real-time weight-based tomato plant height and leaf area index simulation models was high,with an average R²of 0.817 and RMSE of10.81 cm in linear function,polynomial function,and power function tomato plant height simulations,and an average R²of 0.854 and RMSE of 0.55 m²·m^-2in leaf area index simulations,which allowed real-time tomato plant height and leaf area index simulations without disrupting normal tomato growth.The model is practical because it can simulate tomato plant height and leaf area index in real time without destroying normal growth.（4）The tomato growth rate simulation model and the tomato plant height and leaf area index real-time simulation model were constructed based on the microclimate suitability index,and a Web-based microclimate suitability assessment and tomato growth index real-time monitoring platform was established to realize the real-time assessment of the microclimate suitability and tomato plant height and leaf area index of greenhouse tomato growth.The study provides growers with a real time simulation of tomato plant height and leaf area index.The study provides a digital platform for growers to understand the growth of greenhouse tomatoes in real time and provides some reference for production management.