杏是我国北方的主要栽培果树品种之一。杏树树体虽然耐严寒,但花器和幼果对低温却很敏感,开花期低温易造成冻花冻果,致使杏树不能高产稳产。杏树花期遭受冻害的原因和预防措施有以下几点:一、花期冻害的原因1、气候因素:造成冻花冻果的气候因素主要是寒潮和晚霜。杏花受冻的临界温度为初花期-3.9℃,盛花期-2.2℃,座果期-0.6℃。低于这个临界温度,就会遭受冻害。在我地,杏树开花一般在3月20日左右,在华北地区杏树开花期在4月上中旬。这期间气温回升较快,昼夜温差大,晚霜期尚未结束,特别是经常受到西北寒冷空气的袭击,大风伴随降温,最容易造成冻害。2、栽培管理水平:综合管理较 Apricot is one of the main cultivated fruit trees in northern China. Although apricot tree resistant to cold, but flowers and young fruit is very sensitive to low temperatures, low temperature flowering can easily cause freeze-frozen fruit, resulting in apricot can not be high and stable yield. Apricot flower frost damage caused by the reasons and preventive measures are the following: First, the frost damage period reasons 1, climate factors: Frozen flower caused by the climatic factors are cold and night cream. Apricot frost freezing critical temperature of the initial flowering -3.9 ℃, flowering -2.2 ℃, fruit set -0.6 ℃. Below this critical temperature, you suffer freezing damage. In my field, apricot blossom is generally around March 20, apricot flowering in North China in mid-April. Rapid temperature rise during this period, large temperature difference between day and night, the late frost is not over, especially often by the northwest cold air attack, accompanied by wind cooling, most likely to cause frost damage. 2, cultivation and management level: comprehensive management