为提高NC297中部初烤烟叶外观质量和内在品质,共设置3种不同的定色期温湿度烘烤条件,测定烟叶SPAD值变化,含水率变化,烟叶物理指标,叶片变黄、变干程度,主支脉变黄、变干程度,烤后烟叶外观质量,产值和产量,烤后烟叶化学成分等指标。结果表明,1SPAD值总的变化百分比随着烘烤时间的增加而变大,108 h达到最大,以处理3最大达到99.5%。并且各个处理108 h的SPAD值变化率依次为处理3>处理2>处理1。296 h失水速率最大,以处理3的失水速率最大。处理3的失水速率较处理1大0.23%/h,较处理2大0.43%/h。3烟叶纵向卷曲度、烟叶横向卷曲度于烘烤48 h、72 h最大,并且3个处理之间差异不大。4烟叶纵向收缩率、烟叶横向收缩率、叶面积收缩率的值于烘烤120 h后达到最大值,且3个指标都以处理3的值最大,各个处理的显著性没有明显的规律。5处理3的叶面变黄速度最快,72 h变黄9成;处理1的主脉最先变黄,72 h变黄8成。3个处理叶面、主脉、支脉的变黄程度于烘烤84 h、96 h达到10成。6当烘烤84 h后烟叶开始逐渐变干,叶面、主脉、支脉都于144 h变干10成,并且3个处理叶面变干的速度相同。但以处理3的主脉变干最快。7初烤烟叶以处理3的外观质量最好,并且均价最高,上中等比例较高,炉产值最高。8处理3的化学成分最协调,内在品质最优。综上所述,处理3是能较适宜NC297中部初烤烟叶外观质量和内在品质烘烤的工艺。 In order to improve the appearance quality and intrinsic quality of the initially flue-cured tobacco leaves in NC297, three different conditions of baking temperature and humidity were set up. The change of SPAD value, moisture content, physical index of tobacco leaf, yellowing, Main branch yellow, dry degree, the quality of the appearance of the tobacco after baking, output value and yield, the chemical composition of tobacco leaves after roasting and other indicators. The results showed that the total percent change of 1SPAD value increased with the increase of baking time, reaching the maximum at 108 h and reaching 99.5% at the maximum of treatment 3. And the rate of change of SPAD value of each treatment 108 h followed by treatment 3> treatment 2> treatment 1.296 h, and the water loss rate of treatment 3 was the largest. The water loss rate of treatment 3 was 0.23% / h larger than that of treatment 1, and 0.43% / h higher than that of treatment 2. 3 Longitudinal curl of tobacco leaves and lateral curl of tobacco leaf were the highest at 48 h and 72 h, and there was no significant difference among the three treatments. 4 Longitudinal shrinkage of tobacco leaves, transverse shrinkage of tobacco leaves and shrinkage of leaf area reached the maximum after 120 h of baking, and the values ​​of the three indicators were the highest in treatment 3, and there was no obvious regularity in the significance of each treatment. The leaf surface yellowing rate of treatment 3 was the fastest, and the yellowing rate was 97% after 72 h. The main vein of treatment 1 was the first to turn yellow and turned into yellow at 72 h. The degree of yellowing of three treatment leaves, main vein and branch vein reached 84% after baking for 84 h and reached 10% after 96 h. After 84 h of baking, the leaf began to dry out gradually. The leaf surface, main vein and branch vein all dried at 10% after 144 h, and the three treatments dried at the same speed. However, the main artery to deal with the 3 dry the fastest. The quality of the first flue-cured tobacco leaves treated 3 was the best, with the highest average price, the highest middle rate and the highest furnace output value. 8 treatment 3 of the most coordinated chemical composition, internal quality is best. In summary, the treatment 3 is more suitable for NC297 central tobacco leaf appearance quality and baking process.