Studies On The Quality Differences And Division Of Characteristic And High-Quality Flue-Cured Tobacco In Dali, Yunnan Province

Using the methods of correlation analysis, clustering analysis, contribution rate analysis,model building analysis, ecological environment, the quality of tobacco, cause of formation ofquality differentiation and quality division were researched based on the data of climate, soil,some tests, tobacco production and allocation in Dali. The conclusions of this paper were asfollows:The average temperature of every10-day in field period in Dali tobacco planting area wasrelatively stable and small changes. It was20.52℃, which was suitable for the growth offlue-cured tobacco. The ecological conditions for planting tobacco of southern dam area in Daliwere better, west, center and north area as follows. The order of meteorological conditionsinfluence degree to planting tobacco was the average temperature in mature stage, the averagetemperature in field stage, each month rainfall in mature stage and rainfall in field stage. Afterclimate suitability, three parts for planting tobacco were divided. These were southern mountainregion (including Weishan, Midu and Nanjian), western dam region (including Yunlong,Yongping and Yangbi) and the region of Dali city and its surrounding area.Fen-flavor style of Hongda had been clarified. Its cured tobacco leaves had a lighter colorthan other varieties. Most were shallow orange or golden. Its thickness and nicotine contents weremoderate and suitable with high sugar-nicotine ratio and high polyphenol content. Hongda haddifferent growth stage composition, different pigment contents, different fertilizer characteristicsand different curing characteristics.The differences of PPO activity in different varieties were studied using genetic engineering.The results showed that the relative expression levels of Y12501in Hongda were higher than threeother varieties. The results verified that the PPO of Hongda had high activities.In all of the appearance quality factors, leaf position was the most important one for aromastyle characteristics and intrinsic quality, leaf color, leaf thickness and leaf structure as follows. Inthe index of chemical components, sugar-nicotine ratio had the largest effects on fen-flavor stylesignificant, followed by total sugar, reducing sugar, nicotine and potassium-chlorine ratio.Nicotine, total nitrogen and protein contents had the largest effects on tobacco sensory quality, theratio of sugar to nicotine and the ratio of nitrogen to nicotine as follows. Effects of other chemicalcomponents were little.Hydrothermal moderate coefficient, rainfall, average daily temperature in mature stage andaltitude was significant or highly significant positive correlated with fen-flavor type style. The pHvalue in soil and different planting position also had effects. Fen-flavor type style significant ofHongda was the most obvious. Nitrogen rate was the most important cultivation measureseffecting on fen-flavor type style, planting density, leaf number and topping time as follows.On the present production condition in Dali, the order of factor influence degree to economiccharacters, aroma style and chemical constituents were ecological environment (46.71%), cultivated varieties (30.55%), and cultivation measures (22.72%). Compensation measuresfunction (13.43%) was significantly greater than regulation measures (9.29%).Tobacco growing areas in Dali was divided into three regions after analysis. The first regionwas Southeastern typical region for fen-flavor characteristic tobacco which was divided into thesuitable first-selected region (Nanjian, Weishan, Midu and Binchuan) and the suitable substitutedregion (Xiangyun). Southwestern secondary typical region for fen-flavor characteristic tobaccowas the second divided into the suitable first-selected region (Yongping, Yangbi) and the suitablesubstituted region (Yunlong). North center general region for fen-flavor characteristic tobacco wasthe last, which was divided into the suitable substituted region (Dali city and Eryuan) and thesuitable candidate region (Heqing and Jianchuan).Zhongyan104played a better performance after two years screening test. Zhongyan104which has the potential to replace Hongda and K326has good popularization value in Dalitobacco region.