Abstract:

In order to meet the application demand of the cigarette industry for the raw materials of sun-dried yellew tobacco in flue-cured tobacco and find out the suitable optimization measures for the structure of sun-dried yellew tobacco in Dehong Prefecture, Yunnan Province, the effects of the optimization measures on the agronomic traits, part grade structure, economic traits and chemical quality of the sun-dried yellow tobacco were studied by using Yunshai 1 sun-dried yellow tobacco as the material. The results showed that the tobacco structure optimization treatment measures could improve the economic traits such as yield, output value and average price, and the comprehensive performance were better with T2 and T5 treatments, followed by T3 and T4 treatments. It could reduce the proportion of lower tobacco leaves, increase the proportion of middle tobacco leaves and the proportion of superior tobacco, and the effect was T5> T4> T3> T2>T1; Most of the chemical composition contents of the upper and middle tobacco leaves met the requirements of high-quality tobacco leaves, and all of them could meet the industrial requirements, and the overall performance of the upper tobacco leaves was better than T5, T2 and T1. T5, T3 and T4 were the best performers in the middle leaves, and the nicotine content of the upper and middle leaves exceeded 2.0%, the upper leaves of T5, T2 and T1 exceeded 3.0%, and the middle leaves of T2 exceeded 3.0%. Therefore, it was suggested that the best optimization measures for the structure of sun-dried yellow tobacco leaves in Dehong Prefecture, Yunnan Province were as follows: 2 bottom foot leaves were removed 10 days after capping, 2 top leaves were removed when the upper leaves were dried, 4 leaves were subtracted from the number of conventional leaves, and 17 leaves were retained, followed by 2 bottom foot leaves and 1 top leaf were removed during capping, and 3 leaves were subtracted from the number of conventional leaves to retain 18 leaves.

Key words: sun-dried yellow tobacco, Yunshai 1, structure optimization, part and grade structure, quality of tobacco leaf