Abstract:

Control of humidity environment in greenhouse is an important item of humidity monitoring and forecasting.In this paper, the method of seasonal time-series analysis was proposed to predict the air humidity of sunlight greenhouse, the data collected from Oct.2008 to June 2009 in some Gaoyi greenhouse which is representative in Shijiazhuang area was studied. Using the theories and methods of seasonal time series model, an AR(p) model to forecast the local greenhouse inner daily humidity was built up. By comparing the measured value with the estimated value, the RMSE and the average RE were 9.90, -8.65%,it is showed that the AR model can preferably fit the greenhouse inner humidity, and also can be used theory instruction and management supplying in sunlight humidity environment control．