Abstract:  Field experiment was carried out using Zhongyan 100，the main cultivar as material，to investigate the effects of transplanting time and harvesting time on economic characters and quality characteristics of upper six leaves of flue-cured tobacco.The results showed that the transplanting time and harvesting time significantly affected the economic traits of upper six leaves,and there was a very significant interaction effect.The effect of transplanting time on yield and output value was greater than that of harvesting time,while the harvesting time had a greater influence on the proportion of superior  tobacco，single leaf weight and average price of upper six leaves.Transplanting from April 25 to May 5 gave rise to higher yield and output value.Delaying harvest by 6 d and 12 d resulted in no difference in average price,but it was significantly higher than other treatments,with the proportion of superior tobacco increased significantly by 10.66% and 15.39% respectively compared with the normal harvest.The transplanting time was closely related to strong-aroma style of upper six flue-cured tobacco leaves,and the transplanting time no later than May 5 was beneficial to the display of the strong-aroma style of upper six leaves.With the delay of the transplanting time from April 15 to May 5,the potassium-chlorine ratio of upper six leaves increased,and the flammability was better.The content of neutral aroma components was highest when transplanting tobacco from April 25 to May 5.The harvesting time had a great influence on the quality of upper six leaves,as harvesting time delayed,the protein content,starch content,sugar-alkali ratio of upper six leaves decreased,and tended to be optimum when the harvesting time was delayed for 12 days.The sensory quality of upper six leaves showed an increasing trend as a whole as harvesting time delayed,and was the best under a delay of 12 days with significant increase of total amount of neutral aroma components.Comprehensive analysis showed that transplanting from April 25 to May 5 and harvesting with 6-12 days delayed were conducive to improvement of economic characters,quality,and the display of strong-aroma style of upper six tobacco leaves in central Henan．

Key words:  Flue-cured tobacco, Transplanting time, Harvesting time, Upper six leaves, Economic characters, Quality characteristics

摘要： 为探究移栽期和采收期对烤烟上六片叶经济性状和质量特色的影响，以主栽烤烟品种中烟100为材料，设计不同移栽期与采收期的栽培试验，对烤烟上六片叶经济性状、感官品质等进行测定并分析。结果表明，移栽期和采收期极显著影响上六片烟叶的经济性状，且二者存在极显著的互作效应，移栽期对产量、产值的影响大于采收期，而采收期对上六片烟叶上等烟比例、单叶质量以及均价影响较大，4月25日—5月5日移栽，产量、产值较高，采收期延迟6、12 d均价差异不显著但显著高于其他处理，且上等烟比例比正常采收分别显著提高10.66%、15.39%。移栽期与上六片烟叶的浓香型特色密切相关，移栽期不晚于5月5日有利于烤烟上六片叶浓香型特征的彰显，4月15日—5月5日移栽时，随移栽期延迟，上六片烟叶的钾氯比增加，燃烧性较好，中性致香气成分含量均在4月25日—5月5日较高；采收期对上六片烟叶质量的影响较大，采收期延迟，上六片烟叶的蛋白质含量、淀粉含量、糖碱比下降，且在延迟12 d采收时趋于适宜值，上六片烟叶的感官品质整体均呈升高趋势，以延迟12 d采收质量最佳，中性致香成分总量整体表现为显著增加。综合分析，移栽期为4月25日—5月5日、延迟采收6～12 d时，上六片烟叶的经济性状表现较好，浓香型特征明显，品质较优。

关键词: 烤烟, 移栽期, 采收期, 上六片叶, 经济性状, 质量特色