每年在日平均气温稳定在5℃以上时,很多落叶果树如桃、梨、苹果等便相继萌芽开花了。但由于受季风气候影响,此期仍有较强的冷空气南下,有时气温仍有可能降至0℃以下,发生低温冻害,偶尔还会出现“桃花雪”。此时若不采取措施防御,常发生冻芽冻花灾害,对果树的品质与产量造成严重影响。可采取以下防御措施。 物理法 ①果园灌水。在果树萌芽前点浇灌果园2～3 Every year when the average daily temperature is stable at above 5 ℃, many deciduous fruit trees, such as peaches, pears and apples, will germinate and bloom one after another. However, due to the monsoon climate, there is still strong cold air south of this period, and sometimes the temperature may still drop below 0 ℃, low temperature frost damage occurs, and occasionally there will be “peach snow.” At this point if not take measures to defensive, freeze-buds often occur frozen buds, the quality and yield of fruit trees have a serious impact. The following defensive measures can be taken. Physical law orchard irrigation. Before the fruit tree buds pouring orchard 2 ~ 3