The Variation Of Leaf Density And The Realationship With Quality Traits In Wumeng Tobacco-growing Areas In Guizhou

113samples in Wumeng tobacco-growing areas of Guizhou Provincewere studied in this paper, and the distribution of its flue-cured tobacco in tobacco leafdensity were analyzed; analysis of variance was used to study the differences of differentorigin, different flavor between the flue-cured tobacco leaf density, as well as differencesin flue-cured tobacco from different areas, different flavor foliage density and quality ofsensory evaluation; analysis of correlation was used to study the relationship between theflue-cured tobacco leaf density and the other physics, chemistry indicators, as well as therelationship of different origin, different flavor of tobacco leaf density and quality ofsensory evaluation; analysis of cluster was used to study the relationship between theflue-cured tobacco leaf density and sensory evaluation at different levels of quality content.The main conclusions are as follows:1.Based on the113samples in Wumeng tobacco-growing areas, a comprehensivedescription of the statistical analysis about leaf density were conducted. The resultsshowed that the average leaf density of Wumeng tobacco-growing areas was72.20g/m2, itranged from50.49g/m2to89.50g/m2, the coefficient of variation was8.99%, thedissociaton was smaller; Overall its leaf density was within the appropriate range of highquality tobacco.2.The differences of the leaf density were significant among growing regions anddifferent types of aromatic smoking in Wumeng tobacco-growing areas, but the differencein different flavor was not significant. Seen from the variation of tobacco leaf density ofeach origin, the maximum amplitude (50.49g/m2~91.16g/m2) of flue-cured tobacco leafdensity was Weining County, the maximum amplitude (59.33g/m2~86.77g/m2) wasHezhang County; That the coefficient of variation of leaf density in Weiningtobacco-growing areas was9.05%, which was the maximum; The average leaf densityamong different origins appeared as Nayong> Hezhang> Weining; The multiplecomparison results of flue-cured tobacco leaf density among three counties showed that Nayong leaf density was greater, Hezhang leaf density was smaller, the leaf density amongthe three counties had reached0.05significant differences.Tobacco leaf density between different types of aromatic smoking showd as woodFen (75.28g/m2)> Wood sweet type (72.31g/m2)> sweet woody (70.69g/m2); Theamplitude (63.40g/m2~86.77g/m2) of wood sweet was the minimum, the amplitude(50.49g/m2~81.16g/m2) of sweet woody was the maximum; The leaf density amongthree different aroma types reached0.05significant differences.Seen from the variation of flue-cured tobacco leaf density among different flavor, theflue-cured tobacco leaf density of the weak sweet flavor whose coefficient of variation(8.26%) was the minimum, sweet flavor (9.75%) was the maximum; The average valueof each flavor flue-cured tobacco leaf density from high to low showd as weak sweetincense (73.65g/m2)> typical sweet incense (71.87g/m2)> sweet incense (70.74g/m2);The leaf density among three different flavor flue-cured tobacco was not significant.3.Other main indicators of the physical characteristics in Wumeng tobacco-growingareas whose variation was smaller, the coefficients of variation (14.75%) of single leafweight was the largest; The coefficient of variation (6.64%) of leaf length was theminimum; The length of leaf ranged from49.12cm to77.02cm, the average of the lengthwas62.78cm; The width of leaf ranged from14.88cm to26.11cm, the average of thewidth was19.58cm; The single leaf weight ranged from7.51g to15.57g, the average ofthe width was10.39g; The stem ratio ranged from26.21%to40.11%, the average of thestem ratio was31.91%.Through the analysis of the relationship between the flue-cured tobacco leaf densityand other indicators of physical characteristics, the line or curve regression equationbetween the flue-cured tobacco leaf density (x) and other indicators of physicalcharacteristics （y）line or curve regression equation were builded: the relationshipbetween the length and density of tobacco leaf can be a linear function y=0.176x+9.687,the relationship was not significant by F test regression; The relationship betweenleaf density and leaf width can be a linear function y=-0.073x+24.867and it reached thelevel of5%significance; The relationship between single tobacco leaf weight and leafdensity can be a linear function y=0.054x+6.497and it reached the level of1%significance; The relationship between stem ratio and leaf density can be a linear functiony=-0.159x+43.40, and it reached the level of1%significance.4.There were extensive variation about chemical indicators in Wumeng tobacco-growing areas, the average of protein was6.52%, its coefficient of variation(7.74%) was the minimum, the average of total sugar (34.12%) was the maximum, thecoefficient of variation was8.91%, the average of potassium chloride ratio was6.45, thecoefficient of variation (36.82%) was the maximum.The line or curve regression equation of flue-cured tobacco leaf density (x) for thechemical index (y)was builded: the relationship of nicotine and tobacco leaf density canbe a linear function y=0.037x-0.159, the equation F=14.789**; The relationship of TNand leaf density can be a quadratic function y=4.187-0.0743x+0.00057x2, the equationF=4.661*; The relationship between nitrogen bases ratio and tobacco leaf density can bea linear function y=-0.0096x+1.447, the equation F=18.353**. The relationship of totalsugar and tobacco leaf density function can be a cubic function y=16.498+0.01046x2-9.691x3, the relationship was not significant by F test regression; The relationship ofsugar and tobacco leaf density can be a composite function y=28.291×0.998x, therelationship was not significant by F test regression; The relationship of sugar nicotineratio and tobacco leaf density can be a linear function y=-0.245x+32.509, the equation F=11.916**. The relationship between the content of chlorine and tobacco leaf density canbe a quadratic function y=-0.141+0.012x-8.346x2, the relationship was not significantby F test regression; The relationship between the content of potassium and leaf densitycan be a logarithmic function y=5.880-1.011log (x), the equation F=13.266**; Therelationship between potassium chloride ratio and leaf density can be a logarithmicfunction y=27.500-4.923log (x), the equation F=4.119*.5.The analysis of the relationship between the different parts of flue-cured tobaccoleaf density and sensory quality showed that: Nayong tobacco leaf density and theflammability of tobacco was a significantly negative correlation, the correlation was notsignificant between Nayong tobacco leaf density and other sensory quality; Thecorrelation between hezhang tobacco leaf density and sensory quality was not significant;Weining tobacco leaf density and tobacco aroma quality was significantly positivecorrelated with other sensory quality，the correlation to other sensory quality was notsignificant.According to different styles of flue-cured tobacco flavor, the mean values of theindicators of sensory evaluation scores for each group of tobacco samples were statisticed,the aroma quality, aroma quantity, mixed gas, irritation, taste, aftertaste, concentration and smoking of typical sweet flavor had the highest score, followed by sweet flavor, the aromaquality, aroma quantity, mixed gas, irritation, taste, aftertaste, concentration and smokingof weak sweet flavor had the lowest score; The burning of weak sweet flavor had thehighest score, followed by weak sweet flavor, the burning of typical sweet flavor tobaccohad the lowest score; The gray of sweet flavor tobacco leafs had the lowest score,followed by weak sweet flavor, the gray of typical sweet flavor had the highest score; Thescores of tobacco sensory quality varied greatly between different flavor, that aromaquality, burning and gray score had the maximum coefficient of variation, which is sweetflavor of tobacco; That aroma quatity, mixed gas, irritation, taste, aftertaste andconcentration score had the maximum coefficient of variation, which was weak sweetflavor of tobacco; The coefficient of variation of smoking about weak sweet flavor andsweet was equal and the variation coefficient was the maximum.The variance and regression analysis was used to study the relationship betweentobacco leaf density and sensory quality. The results showed that: the regressionrelationship existed in the sensory quality and flue-cured tobacco leaf density. Tobaccoaroma quality, odor, irritation, texture, concentration, gray, smoking scores werenegatively correlated with flue-cured tobacco leaf density; the regression equationbetween tobacco aroma quality, irritation, concentration, gray and tobacco leaf densityreached the level of5%significance, the regression equation between tobacco odor, taste,smoking score and tobacco leaf density reached the level of1%significance.