Abstract:

To obtain the temperature and relative humidity in greenhouse during each grape growth period in advance, give farmers enough time to adjust greenhouse management measures and reduce the risk of meteorological disasters, this paper compared the observation data inside and outside the greenhouse from November 2018 to June 2019. Correlations between temperature and relative humidity inside the greenhouse and meteorological elements outside the greenhouse under different weather types were analyzed, and hourly temperature and relative humidity forecast model in the greenhouse were established through the stepwise regression method. The results show that the temperature and relative humidity inside the greenhouse have the correlations with temperature, relative humidity, wind speed and sunshine duration outside the greenhouse of different levels. On sunny and cloudy days, the correlation coefficients between the factors inside and outside the greenhouse are mostly above 0.3. The correlations are higher and the maximum correlation coefficients are more than 0.9, while the correlations in cloudy days are low. R² of hourly temperature and relative humidity forecast models in the greenhouse are mostly above 0.5. The RSME between the result of the temperature forecast model and the measured value is less than or equal to 3.7℃, and the MAE ≤2.9℃. The RSME of the model-forecasted relative humidity and the measured value are less than or equal to 13.3%, and the MAE ≤10.6%. To conclude, the models filled in the blank of the temperature and relative humidity forecast of the greenhouse grape in each growth period in this area, and could provide scientific reference for field management.

Key words: Greenhouse Grapes, Growth Period, Temperature, Relative Humidity, Correlation Coefficient, Forecast Model