Environment Mathematical Model of Cucumber Cultivation in Multi-Span Plastic Greenhouse

In order to achieve the sustainable development in multi-span plastic covered greenhouse with high production efficiency, it was this research that established the mathematical model of the environment for cucumber production in coupling with the biological model of it, by making use of the knowledge of heat transfer, thermodynamics and the principle of energy balance as the research platform. The simulation was carried in MATLAB environment, tested and verified with actual experiments. As a result, the model was proofed with clear and definite significance in physics, being easy to emulate, being identical with the date of the experiments. By taking the air temperature simulation model as an example, it wins a higher credit value with R² = 0.845, the absolute error being in ±1.7°C, the mean relative error being 5.65%. For the regression analyses, the standard error for the a and b as S_a being 0.0352 less then a/2, S_b being 0.1033 less then b/2.