打顶时间与留叶数对烤烟产质量及内在化学成分的影响

进行了不同打顶时间及留叶数的组合,对烟株叶片大小、株型等农艺性状,及烟叶产质量、内在化学成分等方面影响的试验.结果表明:在本试验设置的处理范围内,随着打顶时间的推迟和留叶数的增加,烟株的株高和节距呈逐步增加的趋势;打顶时间的早晚和留叶数的多少对中、下部叶片大小影响较小,但影响这些部位叶片的单叶重,对上二棚及顶叶的开片及单叶重都具有深刻的影响;留叶数偏少或打顶时间过迟,烟叶的产量会受到一定影响,而留叶数过多,均价、上等烟比例将受到影响,综合产、质量效益以留叶18-20片为最佳;另外,低留叶水平,推迟打顶时间对烟碱含量具有显著的降低作用,高留叶水平时,本试验设置的不同打顶时间对烟碱含量的影响不显著.

Effect of topping stage and the remained leaf number on yields and quality and chemical components of flue-cured tobacco

The test were conducted to study the effect of topping stage and the remained leaf number on agronomic traits, yields, quality and chemical components of flue-cured tobacco. The results showed that the plant height, the distance between internodes increased with the postponed topping stage and the improvement of remained leaf number. The size of middle and lower leaves was effected slightly while the weight per leaf of different stalk position and upper leaf size greatly by topping stage and the remained leaf number. The optimal yield and quality appeared with 18-20 leaves remained per plant. The results also indicated that later topping with properly less remained leaf number would help to reduce nicotine content significantly, but with the more remained leaf number the effect of topping stage was not significant on nicotine content.