Analysis of Ecological Factors and Quality of Flue-cured Tobacco Leaves in Baofeng Tobacco-growing Area of Henan Province

The basic conditions,climatic factors,soil nutrients and quality of flue-cured tobacco leaves in Baofeng tobacco-growing area were analyzed. The number of frost-free period was 204- 248 days,the accumulated temperature above 10℃ was 4 681. 3- 5 247. 5 ℃,the number of days with an average daily temperature above 20 ℃ was about 122- 152 d in Baofeng tobacco-growing areas where there was sufficient sunlight and plentiful rainfall satisfying the climate requirements necessary for the growth and development of high quality flue-cured tobacco.The characteristics of soil nutrient contents in tobacco fields were analyzed,the content of organic substance and available nitrogen were high,the contents of available phosphorus and potassium were suitable and the content of chorine was low. Tobacco leaves of Baofeng had reasonable chemical component and chemical compositions were apt. However,the coordination of the chemical composition in tobacco leaves was inferior to the high quality Zimbabwe tobacco.