Abstract:

To deal with the problems of single flue-cured tobacco variety and adaptive degradation in Chuxiong tobacco region of Yunnan Province, Menghu Township of Yongren County of Chuxiong Prefecture were selected as the experimental sites for the adaptability analysis of ‘Zhusha 2’ and ‘NC297’ flue-cured tobacco varieties. ‘K326’ was used as the control to conduct variety comparison test, and the agronomic characters, photosynthetic characteristics, disease occurrence, economic properties, chemical composition and other indicators of different flue-cured tobacco varieties were investigated and analyzed. The results showed that compared with ‘K326’, the field growth period of ‘NC297’ was 2 days longer and that of ‘Zhusha 2’ was 3 days shorter; ‘Zhusha 2’ had the best agronomic character. The photosynthetic index of ‘Zhusha 2’ was better, and its net photosynthetic rate, stomatal conductance and transpiration rate were 7.25 μmol/(m²·s), 0.19 mol/(m²·s) and 1.88 mmol/(m²·s) higher than those of ‘K326’, respectively. In terms of disease, the field natural incidence rate of ‘Zhusha 2’ and ‘NC297’ was lower than that of ‘K326’. The raw tobacco color of ‘Zhusha 2’ showed a unique color of cinnabar. Compared with ‘K326’, ‘Zhusha 2’ had sufficient oil content, an increase of 2473.5 yuan/hm² in output value, and an increase of 1.7% in the proportion of medium and high grade smoke, showing the best appearance quality and economic properties of the raw tobacco as a whole. The chemical composition coordination of ‘Zhusha 2’ and ‘NC297’ was better than ‘K326’, among which ‘Zhusha 2’ was the best overall. Under the test conditions, ‘Zhusha 2’ has the strongest ecological adaptability and better quality characteristics, and has the potential to be popularized in Chuxiong tobacco area.

Key words: flue-cured tobacco, Zhusha tobacco, varieties, Chuxiong, adaptability