不同打顶时期和驳枝方法对烤烟品种‘K326’上部叶可用性影响

为研究打顶时期和打顶方法对烤烟‘K326’上部叶可用性的影响，采用田间小区试验进行研究。结果表明，生长正常的烤烟选择在中心花开放时打顶最适宜。当烟株发育不正常，特别是出现早花现象后，采用提早打顶后留杈烟栽培（驳枝）的补救措施，可以增加烟株有效叶片数，提高烟叶产量和产值，改善烟叶等级结构和烟叶品质，上部烟叶有趋中部化趋势，更加细腻、柔和，浓度及透气量有所降低。因此，在正常年份以中心花开放时打顶最适宜，异常年份在烤烟15片处留一个腋芽驳枝方法最适宜，能有效提高烤烟‘K326’上部叶的可用性。这对烤烟‘K326’上部叶可用性的提高，烟叶产质量的提升具有重要意义。

Effects of Topping in Different Times and Branching after Topping on Improvement of Usability of Upper Leaves of Flue-cured Tobacco Variety K326

The field trials were studied to improve the usability of upper leaves of flue-cured tobacco variety ’ K326 ’ in March and April 2011.The results of the trial showed that it was more appropriate to top tobacco in the time of the central flowers for the normal growth tobacco plants.However,it was more appropriate to branch after topping in the time of the abnormal tobacco plants,especially for the plants being flowering,early.The effective leaves,yields and qualities of tobacco plants could be also increased by it.And the appearance of the upper leaves of flue-cured tobacco trended to the one of the middle leaves of it in the trial.Therefore,it was very good to top in the time of the central flowers for the normal growth tobacco plants,often.And a bud should be kept at the fifteenth leaf for the branching after topping on an abnormal year,well.By them,the more usability of upper leaves of the tobacco could be acquired.In a word,it suggested that it was very meaningful for the achievement of better yield a quality for ’ K326 ’.