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《宁夏农学院学报》 1989-02
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Yu Beiyari  
In this paper, according to the recorded data by meteorological station of Yongning, the AR-model of the time array bave been established through the treatment of the s moth and stendy. Using the model, the date of the end frost day in 1990-1992 in Yongning area have been forcast-ed of superlong period.
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