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幼龄苹果树的枝条停止生长晚,根系不发达,分布较浅,越冬性不强,非常容易发生枝条脱水、皱缩、干枯等抽条现象。发生越冬抽条的原因主要是由于秋季管理不当,肥水过盛,枝条旺长,生长不充实,冬末早春期间土壤冻结低温,根系吸收的水分较少,而此期空气又特别干燥,加上大风,使根系吸收的水分满足不了树体蒸腾所消耗的水分,从而产生水分生理失调。抽条的危害时期一般是冬末早春的2月中、下旬至3月上、中旬。
Young apple tree branches stop growing late, underdeveloped root system, shallow distribution, overwintering sex is not strong, very prone to shoot dehydration, shrinkage, dry and other pumping phenomenon. The reasons for the overwintering splatter is mainly due to improper management in autumn, excessive fertilizer and water, branches and a long, inadequate growth, cold soil freezing during early winter and early spring, the root absorbs less water, while the air is particularly dry, with Gale, so that the roots can not absorb the water absorbed by the tree transpiration consumed water, resulting in water physiological disorders. Danger of pumping is generally the end of winter early spring mid-February, late March to mid-March.