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落叶果树在日平均气温5℃以上、土温7℃条件下,经过10～15天便能萌发,芽子一经萌动,抗寒力就会降低。据观察:苹果开花时,花瓣遇-4℃即发生冻害,雄蕊在-3℃、雌蕊在-1℃时即被冻死,胚在0至1℃时即受冻害,杏、桃、梨花开得早,更易发生冻害,其预防方法有: 1、延迟萌芽和开花。方法有:(1)灌水喷水。早春多次灌水喷水能降低土温,可延迟发芽。在萌芽后至开花前,连续定时喷水,可延迟开花7～10天。(2)利
Deciduous fruit trees in the average daily temperature above 5 ℃, soil temperature 7 ℃ conditions, after 10 to 15 days can germinate buds once germination, cold resistance will be reduced. It is observed: when the apple flowering, the flower petal case occurs at -4 ℃ freezing damage, stamens at -3 ℃, pistils were frozen at -1 ℃, the embryo at 0 to 1 ℃ when the frost damage, apricot, peach, pear blossom Early, more prone to frost damage, its prevention methods are: 1, delayed germination and flowering. Methods are: (1) irrigation water. Multiple irrigation in early spring water can reduce soil temperature, delay germination. Sprouting to flowering, continuous timing water, can delay flowering 7 to 10 days. (2) Lee