Journal of Zhejiang Agricultural Sciences ›› 2025, Vol. 66 ›› Issue (3): 615-622.DOI: 10.16178/j.issn.0528-9017.20231144

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Stability and regionalization of nicotine, total nitrogen and nitrogen-nicotine ratio in Chuxiong K326 tobacco leaves

GENG Shaowu1(), DING Yishu1,*(), CHAI Yunxia1, LU Yao2,*(), LIN Yunhong3, BU Yunhong1, FU Yanyan2, AI Kebiao1, SUN Jiaxian1, ZHANG Wangong1, LI Xiaoyan1, ZHANG Shengyu2   

  1. 1. Chuxiong Tobacco Company of Yunnan Province, Chuxiong 675000, Yunnan
    2. Agricultural Environment and Resources Institute, Yunnan Academy of Agricultural Sciences, Kunming 650205, Yunnan
    3. Chuxiong Cigarette Factory of Hongta Tobacco Group Co., Ltd., Chuxiong 675000, Yunnan
  • Received:2023-11-07 Online:2025-03-11 Published:2025-04-02
  • Contact: DING Yishu,LU Yao

Abstract:

In view of the chemical quality indexes such as nicotine, total nitrogen content and nitrogen-nicotine ratio that affect the quality of tobacco leaves of the main variety K326 in Chuxiong tobacco-growing area, the stability analysis and the regional study of villages and towns were carried out. The results showed that the absolute stability of nicotine and nitrogen-nicotine ratio of K326 in Chuxiong tobacco area was at a moderate level. The relative stability of nicotine content was generally good in the upper leaves, fair to good in the middle leaves, and good in the lower leaves. The content of nicotine in the upper and middle leaves was lower than that of the quality target of high-quality tobacco leaves, which was 42.80% and 46.68%, respectively. The relative stability of nitrogen-nicotine ratio in upper and middle leaves was generally fair, while that in lower leaves was poor. The nitrogen-nicotine ratios of upper, middle and lower leaves were 57.85%, 48.47% and 66.10%, respectively, which were higher than the quality requirements of high-quality tobacco leaves. The absolute stability variation of total nitrogen content was small. Reducing the nitrogen-nicotine ratios by increasing nicotine content is the key way to regulate the coordination of chemical components of K326 tobacco leaves in Chuxiong tobacco-growing areas. The main production techniques to increase nicotine content include appropriate increase of nitrogen fertilizer, appropriate early topping, reduction of topping height and less leaf retention. It is also expected to make breakthroughs and apply them to production as soon as possible by directional improvement of K326 new lines with high nicotine.

Key words: Chuxiong tobacco area, K326, nicotine, nitrogen-nicotine ratio, stability, regionalization

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