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一、产区冻害概况新干位于江西中部,东经115°22′,北纬28°01′,桔园多分布在赣江、袁河两岸的平原上。全年平均温度17.4℃,最高月平均温度29℃,出现在8月,极端最高温度40.1℃。最低月平均温度5.24℃,出现在1月,极端最低温度-9.1℃。年降雨量1570.5毫米,4—6月多雨,7—9月少雨。霜期始于11月下旬,终于3月上旬,无霜期270天左右。解放后曾出现四次较大冻害,1955年1月10日,最低温度—8.9℃,1967年1月16日,最低温度-8.7℃,1973年12月26日,最低温度—9.1℃,1977年1月5日,最低温度-8.9℃。柑桔受冻后,比前一年约减产四分之一至二分之一。1977年冻害的特点
I. Overview of frost damage in producing areas The new dry land is located in the central part of Jiangxi Province, 115 ° 22 ’east longitude and 28 ° 01’ north latitude. The orange orchards are distributed over the plains on both banks of the Gan River and Yuan River. The annual average temperature of 17.4 ℃, the highest monthly average temperature of 29 ℃, appeared in August, the extreme maximum temperature of 40.1 ℃. The lowest monthly average temperature of 5.24 ℃, appeared in January, the extreme minimum temperature of -9.1 ℃. The annual rainfall of 1570.5 mm, April-June rainy, July-September juvenile. Frost began in late November, and finally in early March, frost-free period of 270 days. After the liberation there have been four major frost damage, January 10, 1955, the lowest temperature - 8. 9 ℃, January 16, 1967, the lowest temperature - 8.7 ℃, December 26, 1973, the lowest temperature -9.1 ℃, 1977 January 5, the lowest temperature of -8.9 ℃. After the citrus was frozen, about one quarter to one half less than the previous year. The characteristics of frost damage in 1977