Classification and Assessment of Wind and Hail Disaster of Winter Wheat

17 cases relating to winter wheat growth were selected from among 33 hail events during 1981 to 1990. The wind and hail disaster of winter wheat was studied. The hail diameter,the duration of hailfall and the gust during hailfall were used as the factors,the classification and assessment of wind and hail disaster were conducted. The application shows that it is significant for raising the administrative level of the agricultural disaters.

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