Abstract:

Sanmenxia tobacco growing area has been restricted by climatic conditions for a long time. In the late stage of growth and development of tobacco plants, there is a low temperature and rainy condition, which leads to the slow maturation process of upper tobacco leaves and the poor maturity of roasted tobacco leaves, resulting in the reduction of industrial availability of tobacco leaves. In order to solve this problem, this study combined a new type of mineral source organic fertilizer with traditional phloem ring peeling (HT) and two plant growth regulators (ZT, MT), to study the effect of maturity yellowing regulation. The results showed that the application of mineral source organic fertilizer (FT) could significantly improve the maturity of upper tobacco leaves, significantly increase the proportion of high-quality tobacco, and generally improve the coordination of chemical composition and sensory quality. Among them, FT-MT had significant effects in increasing the proportion of high-quality tobacco, increasing the potassium content of tobacco leaves, and improving the potassium chloride ratio of tobacco leaves. FT-ZT had a significant effect on improving the sugar alkali ratio, increasing aroma, and reducing impurities in tobacco leaves. FT-HT tobacco had the highest maturity, and the total sugar, reducing sugar, and two-sugar ratio were the most in line with industrial demand goals.

Key words: organic fertilizer, mineral source, maturation control, girdling, plant growth regulator, upper tobacco leaves, usability