果树抽条是低温引起的生理干旱,即“冻旱”。冬春季节,天寒地冻,根系吸收水分的能力大大减弱,而地上部分仍继续蒸腾消耗水分,由于蒸腾量大,吸收水分少,造成枝条逐渐失水、皱缩、直至干枯死亡。抽条对果树生产的威胁很大,特别是幼龄果树更容易发生抽条。 1979年武清县新发展果树5,189亩,111,881株,是历史上最多的一年。由于各种原因,冬季发生了严重的抽条。为了摸清引起抽条的主要原因及其几种预防措施的效果,去年春季我们在普遍调查的基础上,又对10个典型果园作了重 Fruit tree drawing is a physiological drought caused by low temperature, that is, “freezing drought.” In winter and spring, when it is cold and cold, the ability of roots to absorb water is greatly weakened, while the aboveground parts continue to evaporate and consume water. Due to the large amount of transpiration, less water is absorbed, causing the branches to gradually lose water and shrink until they die dry. Sampling of the threat to the production of fruit trees is very large, especially in young fruit trees are more likely to spike. In 1979 Wuqing County, the new development of 5,189 acres of fruit trees, 111,881 strains, is the history of the year. Severe draws occurred in winter due to various reasons. In order to find out the main causes of the striping and the effects of several preventive measures, last spring we conducted a survey on the basis of a total of 10 typical orchards