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【Objective】The present paper aimed to provide theoretical basis for the rational application of potassium and chlorine fertilizer in the flue-cured tobacco production in Yunnan raw material base of Yunyan brand.【Method】 1130 soil samples from 37 counties of Kunming, Qujing, Honghe, Baoshan, Wenshan were used as materials to determine the content of potassium and chlorine in tobacco samples. The characteristics of potassium and chlorine ratio in different regions, main varieties, soils at different altitudes and tobacco leaves in Yunnan raw material base of Yunyan brand were analyzed. The potassium chlorine ratio of tobacco leaves was regionalized by ArcGIS. 【Result】The results showed that the samples with potassium chloride ratio more than 10 % were the most, accounting for 43.2 %; The samples with potassium chloride ratio between 4.0 % and 6.0 % were the least, accounting for 11.7 %. Qujing had the largest number of towns with low K/C ratio(< 4 %) and Wenshan had the smallest; Qujing had the largest number of towns with high K/C ratio(> 10 %), while other cities had the same number. The main cultivar with the highest mean of K/C ratio in middle tobacco leaves was Yunyan 85, which was 14.41; The lowest was Yunyan 97, which was 7.30; The others were between 8.44 and 12.73. The highest mean of K/C ratio of middle tobacco leaves in different altitude areas was 11.72, which was mainly distributed in the altitude area of 1100-1400 meters; The lowest was 8.91, which was mainly distributed in the altitude area of 2000-2300 meters. 【Conclusion】In order to production of high-quality flue-cured tobacco in Yunnan raw material base of Yunyan brand, areas with high K/C ratio of tobacco leaves in Kunming, Qujing, Honghe, Baoshan and Wenshan could be selected. K326, Yunyan 87, Yunyan 85 and other high efficient flue-cured tobacco varieties for potassium accumulation and utilization could be selected. It could be planted at the altitude of 1100-2000 meters. [ABSTRACT FROM AUTHOR]

[Objective]The present paper aimed to clarify the relationship between soil nutrients and chemical components of tobacco leaves in Kunming tobacco area, so as to provide theoretical basis for the production of high-quality flue-cured tobacco in Kunming tobacco planting area.[Method]The relationship between soil nutrient status and chemical composition of flue-cured tobacco in Kunming tobacco area was studied by descriptive statistics and canonical correlation analysis.[Result] The results showed that the pH value of tobacco planting soil in Kunming tobacco area was generally suitable,content of available nitrogen was higher, and the content of effective phosphorns was was moderate but not balanced. The content of available potassium was abundant, and chloride content was at medium low level, but the distribi and reducing sugar of tobacco leaves in Kunming tobacco growing area was high, the alkali ratio were moderate, potassium and chlorine content were relatively low, but but potassium and chlorine were relatively High. Canonical correlation analysis showed that there was a significant correlation between soil nutrients and the main chemical components of tobacco leaves in Kunming tobacco growing areas. [Conclusion] Within a certain range, the decrease of soil pH value, oiganic matter and chloride ion content was consistent with the decrease of nicotine and total nitrogen in flue-cured tobacco leaves; the content of available potassium and available phosphorus in soil was consistent with the increase of total sugar, reducing sugar, potassium content, nitrogen-alkali mtio, potassium-chloride ratio and sugar-alkali ratio in flue-cured tobacco leaves. [ABSTRACT FROM AUTHOR]

【Objective】 The purpose of experiment is to explore the relationship between planting altitude and aroma composition of NC102. 【Method】 170 samples of flue-cured tobacco leaf from 1600-2200 m altitude were collected in Kunming NC102 planting area, and their aroma composition were detected by distillation cxtraction-gas chromatography/mass spectrometry.DPS statistical software was used to analyze the correlation between planting altitude and the content of tobacco aroma components. 【Result】 The n-valeraldehyde and geraniol content of upper leaves of NC102 were extremely significant negative correlation with planting altitude, and 3-hydroxy-2-butanone, furfural, 2-acetyl furan, linalool, geranylacetone and 3-hydroxy beta Malaysia ketone content were significant negative correlation with planting altitude.The3-methyl-2(5 H)-furanone content of middle leaves of NC102 was extremely significant negative correlation with planting altitude, and valeraldehyde, benzaldehyde, 2-pentyl furan and linalool content were significant negative correlation with planting altitude.The aldehydes of upper leaves of NC102 was extremely significant negative correlation with planting altitude, and the unitary linear regression equation was y=94.7319-0.0353 x;the ester of middle leaves of NC102 were extremely significant positive correlation with planting altitude, and the unitary linear regression equation was y=-75.8251+0.0587x. 【Conclusion】 The contents of n-valeradehyde and aromatic camphor in the upper and middle leaves of NC102 planted within the altitude range of1600-2200 m in Kunming tobacco area were significant negative correlation with planting altitude.Compared with low altitude, the contents of the products of maillard reaction in the middle and upper leaves of NC102 planted in high altitude area were decreased.The effect of altitude on tobacco leaf quality should be emphasized in the planting planning of NC102. [ABSTRACT FROM AUTHOR]