Study on relationship between soil pH-value and sugar content of tobacco leaves in Qujing tobacco-growing areas.

The change trend of pH-value of soil,and total sugar and reducing sugar content of tobacco leaves in Qujing tobacco-growing areas was analyzed in this study.The results showed that the content of total sugar and reducing sugar was 314.69 g/kg and 237.42 g/kg,respectively.The order of total sugar and reducing sugar content in different grades of flue-cured tobacco leaves was C3FX2FB2F.There was close relationship between soil pH-value and tobacco total sugar and reducing sugar content.However,it was not a simple linear relation.It was not good for sugar formation and accumulation when soil pH-value was too high or too low.