苹果幼树越冬抽条是我国北方普遍存在的问题。抽条的原因是2月中旬以后,苹果幼树地上部分水分蒸发转旺而土壤尚未解冻,根系吸水较弱,造成水分的供需失调。此外枝条不充实,发生冻害或造成伤口,都会加剧抽条。目前,预防苹果幼树抽条比较有效的措施就是埋土防寒,但2～3年生长势良好的苹果幼树,卧条埋上防寒有一定的困难,而且弯干时易损于伤枝。九一至九三年,我们通过实践,总结出一套苹果幼树露地越冬防抽条技术,现在介绍给大家。 1、前促后控,促进枝条充实。雨季过后控水控氮,增施磷钾肥。8月下旬或9月上旬喷一次0.3% Wintering apple tree saplings are common problems in northern China. The reason for drawing is that after mid-February, the water in the shoots of young apple trees evaporates and the soil has not yet been thawed, and the root system has weak water absorption, resulting in the imbalance of water supply and demand. In addition the branches are not full, freeze damage or wounds, will exacerbate the strip. At present, the prevention of apple seedling pumping more effective measures is buried in cold, but 2 to 3 years growing good apple seedlings, lying on the cold there are some difficulties, and vulnerable to injury when bent stems. From 1991 to 1993, we summed up a set of apple sapling open-air anti-spill wintering technology, now introduced to everyone. 1, before the promotion of control, to promote full of branches. After the rainy season to control water, increase phosphorus and potassium. In late August or early September spray a 0.3%