Study On Greenhouse Fruit Cucumber Growth And Development Simulation Model

The model of crop growth is a hot point of the digital agricultural research.The model of growth and development of horticultural crops in greenhouse can be provided for greenhouse environment control and crop growth and development quantitative management.Therefore,in this study,"jasper" fruit cucumbers with the unlimited growth type are used as subjects,and a number of field trials were conducted in Rui Jing Agricultural Science and Technology Park in Zhenjiang City and controlled multi-span glass greenhouse of Agricultural Engineering Academy of Jiangsu University to collect data for model development and validation.Firstly,a model for greenhouse fruit cucumber growth and development simulation was developed based on the physiological development of fruit cucumber in greenhouse. Secondly,the model for simulating the establishment of organs of greenhouse fruit cucumber was based on the cucumber distribution model of assimilation,so was the model of dry-matter distribution based on the model for simulating the establishment of organs of greenhouse fruit cucumber.In greenhouse fruit cucumber development model,to the average date temperature as the development scale,the time reached on various growth stages of cucumber was quantified based on the Sine index model.The test data with different place and time was used to verify the model.The results show that the root mean squared error(RMSE) for the prediction of germination,seedlings,sucking vine,the early harvest and harvest period were 0.5,1.12,1.87,1.58,2.55d,respectively. Compared with Growing Degree Days(RMSE for 0.87,3.54,1.80,1.58,and 6.04 d), the forecast precision of exponential sine equation preceded.In the simulation model of organs of cucumber fruit building in a greenhouse,the relationship of the main characteristics of cucumber plant growth and development and temperature was analyzed based on the study of the changes of organ growth and development of cucumber fruit with unlimited growth pattern in soiUess culture.The parameters of the model was determined based on analysis of the test data.The model was validated,and the results show that the selected model can accurately predict the leaf of cucumber.According to the model of leaf expansion based on observational data,the test model was validated through the different observational data,the results of model simulation and experimental observations are basically the same.In the model of dry-distribution,the leaf age of different plants leaves and the distribution of assimilation at different positions were confirmed based on the distribution process of assimilation in combination to the organ building process. Construction of the use of the redistribution of the assimilation model,using experimental data,the model built is verified by preliminary analysis,the results show that the simulated values and observed ones have a better consistency,the model meets the reliability and accuracy in a certain extent.In this paper,the simulation model of greenhouse cucumber fruit growth and development can predict the reproductive process of the cucumber and the form of structure and dry-distribution in the various stages with higher accuracy,and rational and practical property.It plays the leading role for greenhouse cultivation and management control scientific.