宁夏于五十年代初引入苹果,现已遍布全区各县。随着苹果的发展,生产过程中的气象问题日益突出。首先是苹果的越冬冻害和枝条抽干死亡;其次是开花期或幼果期的晚霜冻害,在很大程度上影响着苹果的发展及其产量的稳定性。同时,在引种扩种问题上,没有全面地考虑苹果的生物学特性及其栽培界限, Ningxia introduced apples in the early 1950s, and now it has spread all over the county. With the development of apple, the weather problem in the production process has become increasingly prominent. The first is the apple overwintering frostbite and the death of shoots, followed by the frost damage at the flowering or young fruit stage, which affects the development of apple and the stability of its yield to a great extent. At the same time, the introduction of seed expansion, did not fully consider the biological characteristics of apple and its cultivation boundaries,