Study On Climatic Characteristics In Growing Areas Of Strong-aroma Flue-cured Tobacco And Its Relationship With Leaf Style

To study the relationship between climate condition and the formation of tobacco quality and style, collected climate data of nearly 30 years and tobacco leaf samples in recent years from eight major flue-cured tobacco planting regions in China, analyzed general characteristics of climate index and smoking results and chemical composition of tobacco of each region.Andregion. And set up a validation test of light hours in pingdingshan baofeng. The main results were as follow: 1. general characteristics of climate index of flue-cured tobacco planting regionsCoefficient of variation of some temperature indicators, average relative humidity of mature stage and atmospheric pressure was low, and under 10 percent. Mature period average temperature and surface temperature in mature concentrated near the 25.3 ℃ and 28.5 ℃ respectively. Average relative humidity in mature concentrated in the range of 74 percent to 85 percent. Variability of accumulated temperature of tobacco root extension period was great, especially the accumulated temperature more than 20 ℃ and the days more than 20 ℃ was extremely significant. 2. The relationship between climatic factors and the tobacco leaf quality and style characteristicsTobacco burnt sweet and sweet aroma significantly positive correlated with the maturity day temperature.Full flavor style degree and flue gas sink overflow significantly positive correlated with the maturity day temperature and the days more than 30 ℃. Burnt sweet aroma significantly negative correlated with diurnal amplitude of each period and sunlight hours of the whole growth period,and significantly positive correlated with the rainfall of each period. Smoke concentration and accumulated temperature higher than 10 ℃ of whole growth period reached extremely significant positive correlation. 3. The effect of reducing sunshine hours on quality and characteristic of tobacco leaves in mature stageChlorophyll a, chlorophyll b and carotenoid contents of shading 1.5 hours and 3 hours were significantly higher than that of the control treatment in upper leaves and middle leaves. Contents of reducing sugar and total sugar in upper leaves and middle leaves were significantly higher than that of the control treatment. Contents of potassium nicotine and total nitrogen were increased with the reducing illumination hours in mature stage, which were highest in shading 3 hours. Effect of reducing light hours to tobacco style in flue-cured tobacco planting regions was smaller, but the tobacco aroma, aroma quality decreased, green hybrid gas aggravate. Reducing sunlight hours was not conducive to the improvement of the quality of the tobacco aroma and characteristics in mature stage.