关键词: 西南烟区, 烟草品种, 叶片发生, 叶片生长, 模型

Abstract: In order to clarify the dynamic process of tobacco leaf development in southwest tobacco growing areas and realize accurate and controlled production of tobacco leaves, this paper carried out field comparative experiments to study the leaf occurrence and growth rhythm of 4 major cultivated varieties including K326, NC89, Yunyan 85 and Honghuadajinyuan, and established Richards growth dynamic models, respectively. The results showed that the R2 values of all growth models were above 0.980, indicating that the models had high degree of accuracy. The leaf occurrence models of these 4 varieties were all of atypical “S” type growth curve, while the leaf growth models were of typical “S” type growth curve. The leaf numbers of different varieties were basically the same, 38~40 pieces. But the leaf occurrence process was obviously different. The leaf number of Honghuadajinyuan  reached the maximum at 35 d after transplanting, and the other 3 cultivars reached the maximum leaf number at 42 d after transplanting. The order of maximum middle leaf areas of different cultivars was Honghuadajinyuan >K326 >Yunyan 85 >NC89, but their growth process was basically the same. The slow growth period was 12~14 d, rapid growth period was 16~17 d, and stable growth period was 30~31 d.

Key words: southwest tobacco growing areas, tobacco variety, leaf occurrence, leaf growth, model