苹果冻害调查

１９９３年１１月２１日，由于气温骤降，使吕梁等地苹果树主干严重受冻。冻害以５～１０年树为主，伏锦、金冠比红富士受冻轻；柳林红等短枝型品种比红星受冻轻；山峁地树比低洼地树受冻轻；丘陵地下部比丘陵地上部树受冻轻；冻前灌水树比不灌水树受冻轻。气温骤降，低温持续时间长，栽培管理不当是这次冻害的主要原因。

An Investigation of Cold Damage in Apple

On November 21, 1993,the sudden drop of temperature made the trunk of apple trees suffer from cold damage in Luliang prefecture. The damage trees were mainly of five to ten years age. Fujin and Golden Delicious suffered obviously less serious than Red Fuji.The short branch trees as Liulinghong suffered less seriously,trees on the hills less than those on low land,trees on higher part of hilly land less than those on the lower part and trees irrigatedless than trees unirrigated. The main reasons for the cold damage were the sudden drop of the temperature,the long-lasted low temperature and the improper cultivation and management.