【摘要】 <正> 我区自五十年代初引种苹果以来,发现“冻旱”(2—3月)危害幼树越冬,造成“抽条”死亡。以后,又相继发现早霜冻(即深秋冻,9月底—10月上旬)、仲冬冻(11月中旬)、深冬冻(12月—1月)和晚霜冻(即春霜冻,4月下旬—5月中旬)等多种类型的冻害。特别是近年在1981年出现的严重早霜冻害,使成批的幼令苹果园和更多还原

【Abstract】 This paper deals separately with various weather factors,dates ofpossible frozen damages and correlation between degree of temperaturefalling and frozen grades by using weather records from 1951 to 1983of Yongning County Weather station in Ningxia.As a result,threekinds of multivariate linear regression equations have been establishedby using different weather factors in different periods in closecorrelation as the self variables-i,e.predicting model of Dates,Temperature and Grades.After having been tested,all of them wereright.The historical fitting rates were 85%,78% and 100% res-pectively,which were right in forcasting wheather in 1984.Therefore,this is one of easy predicting methods at present.更多还原