Relationship Between Sunshine Hours During Field Period And Tobacco Quality In Qujing Planting Area

The difference of sunshine hour between different country areas, soil ecotype areas, altitudeand groups was analyzed in this paper which based on101flue-cured tobacco samples of101sunshine hour dates in9tobacco countries of Qujing. The changing characteristics of flue-curedtobacco’s appearance quality, physical characteristics, chemical components and smoking qualitywere also studied among different groups under different sunshine hours, and so did therelationship between sunshine hour and tobacco quality. Main findings are as follows:1.The sunshine hour of entire tobacco field in Qujing was assessed and analyzed. Resultsshowed that: the average sunshine hour was670.15±26.88h in Qujing tobacco field.90.10%ofsamples’ sunshine hour was in the context of600.00~700.00h, and which was mostly in thecontext of660.00~670.00h,18.81%of total samples. The sunshine hour of Qujing tobacco fieldwas close to the normal distribution.2.The variation of sunshine hours of all fields in Qujing area was analyzed. Results indicatedthat, in different counties of Qujing, the county of Huize had the most sunshine hours (709.19h).The sunshine hours of Shizong (640.24h) and Fuyuan County (638.73h) were relatively lower.The coefficient of variation in Luoping County was the smallest, only0.87%. In the6differenttobacco soil eco-environment of Qujing, the highest sunshine hours is high-altitude area of purplesoil (700.35h), and the lowest altitude is in red soil area (659.52h). Coefficient of variation of redsoil area of vertical zonality was the smallest, only2.48%. In different altitudes, high altitude areahad the highest sunshine hours (675.90h), followed by elevation in mid-altitude tobacco-growingareas (668.02h), the lowest sunshine hours is tobacco-growing areas of low-altitude area(662.43h).Depending on the sunshine hours the samples were divided into low, medium, high,3groups.Low class contained25.74%of samples of all, and variable amplitude was604.81~626.25h;medium class contained67.33%of samples of all, and variable amplitude was635.81~685.10h; High class contained25.74%of samples of all, and variable amplitude was688.12~749.32h.3.The relationship between sunshine hour and appearance quality of different groups wasstudied by the method of variance and regression analysis. Results indicated that the sunshinehours between groups of different subject outside the color score differences are not significant.Other indicators have reached a significant level of difference, of sunshine hours in high maturityof flue-cured tobacco and oil to score high, and identity, structure and color score low. The sameregression analysis showed: sunshine hours in high maturity of flue-cured tobacco and oil contentthan the tobacco that the low sunshine hours, and low sunshine hours’ identity, structure and colorof tobacco leaf tobacco that the score was higher than the number of hours of sunshine and highareas.4.The different groups of sunshine hours and the chemical composition of flue-cured tobaccowas analyzed by the method of variance, results indicated that routine chemical components in thesunshine hours and there was no significant relationship between nicotine and petroleum etherextract content. The more sunshine hours, the more total sugars, reducing sugars and starches were.But the nitrogen and chlorine levels were very low. Other chemical components in flue-curedtobacco just like sulfur, manganese, magnesium, molybdenum, hyoscyamine, volatile acid andvolatile alkali were very different between the different groups. When the sunshine hours werehigh, the content of manganese was high, but the content of volatile acids was low. MO,scopoletin and volatile alkali content in groups was the highest.The relationship of different class group sunshine hours’ number and flue-cured tobaccochemical components was studied by using simple correlation analysis, results indicated that:when the sunshine hours’ number was in the range of688.12~749.32h, as the sunshine hourincreasing, the flue-cured tobacco zinc and rutin was also increased, and potassium ion contentwas reduced; when the sunshine hours’ number was in the range of635.86h~685.10h, as thesunshine hour increasing, the flue-cured tobacco total nitrogen and potassium ion content wasreduced; when the sunshine hours’ number was in the range of604.81~626.25h, with increasingsunshine hours,the flue-cured tobacco total sugar, starch, magnesium and manganese content ofchlorogenic acid presented a increasing trend, but total content of nitrogen, calcium, copper andhyoscyamine pavilion was a reducing trend. 5.The relationship of different groups of sunshine hours and the physical characteristics offlue-cured tobacco was analyzed by the method of variance, results indicated that the difference ofother indicators had reached a significant level except the weight of a single leaf and theequilibrium moisture. Sunshine hours in high leaf, stem density and fill rate, leaves value ishigher.Used simple correlation analysis the relationship of different class group sunshine hours’number and flue-cured tobacco chemical components was studied, results indicated that: when thesunshine hours’ number was in the range of688.12~749.32h, as sunshine hours’ number ofincreasing, the flue-cured tobacco leaves density was presented a trend of increasing, and leaveslong was reducing; when the sunshine hours’ number was in the range of635.86h~685.10h, as thesunshine hours increasing, the flue-cured tobacco leaves long was reducing; when the sunshinehours’ number was in the range of604.81~626.25h, with sunshine hours’ increasing, the fill value,weight of single leaf and balance flue-cured tobacco moisture content was increasing.6.The relationship of the different group sunshine hours and smoking quality of flue-curedtobacco was analyzed by the method of variance, results indicated that all the other indicators hadreached a significant level of difference except the irritation, gray, concentration and flavor andsoft in different groups under different sunshine hours. Sunshine hours in high got a high strengthscore, and low sunshine hours’ sweet temperament and sweet score were low. Fragrance, mixedgas, aftertaste, combustion, and dry sense got the highest scoring in the group.Used simple correlation analyzed the relationship of different groups sunshine hours andsmoking quality of flue-cured tobacco, results indicated that when the sunshine hours’ number wasin the range of635.86~685.10h, with increasing sunshine hours, the mixed gas, stimulus,aftertaste, combustion, and flavor, sweetness and gentle score was increased in trend andmomentum score was reducing. when the sunshine hours’ number was in the range of604.81~626.25h, with increasing sunshine hours of dry feel, sweetness and gentle scored aincreasing trend.