Effects of apex regulation on the contents of potassium and nicotine in flue-cured tobacco | 不同顶端调控措施对烤烟钾及烟碱含量的影响

chinois. 为探讨烤烟品质的生理调控措施，于2007年在甘肃省庆阳市正宁县进行了大田试验，研究了打顶及打顶后涂抹旷萘乙酸（NAA）、激动素（KT）和吲哚乙酸（IAA）3种外源激素对烟叶钾素和烟碱含量的影响．结果表明：打顶显著降低了烟叶钾含量，下降幅度为7．78％～20．1％，以上部叶最为显著；打顶显著提高了烟叶烟碱含量，增幅为33．5％～34．3％．打顶后涂抹3种外源激素均能显著提高烟叶钾含量，其中以KT效果最佳，上、中、下部叶分别增加了57．42％、26．62％和40．26％；打顶后涂抹3科外源激素均能显著降低烟叶烟碱含量，改善烤烟品质，其中烟碱含量以KT降幅最大，NAA次之，IAA最小，改善烤烟品质，以KT的效果最佳．[著者文摘]

anglais. In order to investigate the physiological regulation measures on tobacco quality, effects oftopping and smearing three exogenous hormones,IAA,KT and NAA,after topping on the contents of thepotassium and nicotine in flue-cured tobacco have been studied by the field experiment in Zhengning County, Qingyang City, Gansu Province in 2007. The results showed that potassium content in tobacco leaves de-creased significantly by 7. 8 % ～20.1% after topping, especially in upper leaves,while nicotine content increased significantly by 33.5 %～34. 3 %. Swearring three exogenous hormones after topping could significantly increase potassium content and decrease nicotine content, and improve flue-cured tobacco quality. The content of potassium increased most under the treaLment of smearing with KT,which increased 57. 42 %, 26.62% and 40. 26 % in upper,middle and lower leaves respectively. Meanwhile the content of nicotine decreased most under KT treatment, then NAA treatment, and decreased lest under IAA treatment. The quality of flue-cured tobacco was best when swearring KT after topping.[著者文摘]