Abstract: Four typical tobacco soils in South Anhui Province were selected to investigate the dynamic changes of carbon2nitrogen metabolism and total sugar content during the growth and development of flue2cured tobacco. The results showed that the carbon2nitrogen metabolism of tobaccos grown in Alluvial sandy soil and coarse sandy soil presented a similar trend of dynamic change.During the early and middle growth stages of tobacco,both carbon metabolism and nitro2 gen metabolism were at a high level. The activity of nitrate reductase decreased significantly in bottom leaves after trans2 plant for 45 d,and in middle and top leaves after transplant for 60 d. The invertase activity also decreased after peak val2 ues,but its degree of decrease was much less than that of nitrate reductase. The content of total sugar was at the highest level for both sandy soils. For the rice clay soil,the level of carbon2nitrogen metabolism was relatively low at early and middle plant growth stages compared to the Alluvial and coarse sandy soils,and its peak time was much delayed.At late growth stage,the level of nitrogen metabolism was relatively high,but the sugar content was relatively low. For the powder sandy soil,the peak time of carbon2nitrogen metabolism appeared early,and maintained a low level during the whole plant growth season. The sugar content in powder sandy soil was also lower than in sandy soil.

Key words: Flue2cured tobacco, Soil type, Sweet aroma, Carbon2nitrogen metabolism, Sugar accumulation

CLC Number: 

• S572.01