The time series model is decomposed into the trend items, cycle items and random items, respectively extracted by the establishment of the various forecasting model, the model is applied to the Chahayang farm in 1956 to 2008 on-year growth period crops fitting rainfall forecast, the results show that the model can reveal the crop growth period variation of monthly rainfall, for the rational development of irrigation system, rich years to predict the future years status of rainfall, the size of water resources, as well as the size of floods and other aspects important to.
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