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解放后较为严重的冻害有1955年1月24日,1969年2月6日和1977年1月30日三次。1977年这次冻害,使长江下游几省的成龄树受冻达1412.2万株,占总结果树的72.3％,其中冻死121.85万株,占总结果的6.3％。根据每8—11年出现一次周期性冻害这一规律,预测明、后年有可能出现一次较大的冻害。因此,研究柑桔的冻害及相应的抗寒栽培技术应该受到足够的重视。 一、影响柑桔冻害的主要因素 1.植物学因素 影响柑桔冻害的植物学因素包括树种、品种、砧木类型、不同繁殖方法以及不同树龄和树势等。根据冻害后的调查,我国现有各种柑桔种类及其品
After the liberation of the more serious frost damage on January 24, 1955, February 6, 1969 and January 30, 1977 three times. The frostbite in 1977 caused 14,122,000 adult trees to freeze in the lower reaches of the Yangtze River, accounting for 72.3% of the total. Among them, 1,218,500 were frozen to death, accounting for 6.3% of the total. Based on the law of periodic frost damage occurring every 8-11 years, it is predicted that there may be a large frost damage later in the year. Therefore, the study of citrus frost damage and the corresponding cold cultivation techniques should be given enough attention. First, the main factors affecting citrus frost damage 1. Botanical factors Botanical factors affecting citrus frost damage include species, varieties, rootstock types, different breeding methods and different ages and tree shores. According to the investigation after frost damage, our country has all kinds of citrus varieties and their products