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[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 aim of this paper is to fully understand the temporal and spatial variation of soil nutrient in the cultivated land in Kunming district. [Method] Based on the analysis of 3907 farmland soil samples collected from 7 counties in Dianehi district of Kunming city, combined with ‘3S’ technology, the spatial distribution and change of soil nutrient content of farmland in Kunming city were studied. [Result] The results showed that the area with medium available boron content in the cultivated land in Dianehi district of Kunming city accounted for 70.08%, and the area with deficient available boron content accounted for 28.29%. The area with medium available zinc content accounted for 63.18% . Most areas of other nutrients were rich or more abundant. According to the average value of soil nutrient, the total nitrogen and alkali hvdrolysable nitrogen in the Dianehi district of Kunming city reached a rich level, while the organic matter, available phosphorus and available potassium were rich. Except for available boron, the average contents of effective manganese, effective zinc and effective molybdenum of trace elements were in high or higher level. The nutrient contents of vegetable land and seasonal vegetable land were higher than that of the dry land of fruit trees. [Conclusion]The total nutrient content of arable soil in Dianehi district of Kunming city is rich. Compared with the second national soil survey data, the contents of soil organic matter, total nitrogen, alkali hvdrolysable nitrogen, a-vailable phosphorus and available potassium are generally increasing. In the process of fertilization, it is necessary to combine the technology of improving the soil quality of cultivated land to achieve precise fertilization, and improve the utilization rale of fertilizer and the ability of soil fertilizer supply. [ABSTRACT FROM AUTHOR]