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我国北方寒地果树栽培地区、造成寒害的原因之一就是花期的晚霜和雪害。华北和西北地区晚霜结束较晚,花期冻害频繁,一些抗寒性的苹果品种,虽然能抵抗秋冬不良的气候,却难以躲过春季晚霜或降雪造成的灾害。1955年5月23日吉林延边苹果梨盛花期逢雪害,当年减产一半以上,1972年5月13日内蒙后山降大雪,小苹果黄太平花全部冻死,当年无产量。1977年5月1日呼和浩特凌晨霜冻並降雪,气温下降,苹果花器受
One of the reasons for cold damage in fruit-growing areas in the northern part of China is the frost and snow damage of flowering. Late night frost in northern and northwestern China is late, frost damage is frequent in flowering stage, and some cold-resistant apple cultivars can hardly avoid the disaster caused by spring frost or snowfall though they resist the bad weather in autumn and winter. May 23, 1955 Apple blossoming in Yanbian, Jilin Province suffered snowstorm, and the output was cut by more than half that year. On May 13, 1972, after the snowfall in Inner Mongolia, the yellow apples of small apples were all frozen to death, and no yield was produced in that year. May 1, 1977 frost and snowfall in the early morning of Hohhot, the temperature dropped, apple flower by