In order to clarify the curing characteristics of the lower leaves of flue-cured tobacco HN2146,the change of color and SPAD value,characteristics of yellowing and browning,water loss,chlorophyll degradation and polyphenol oxidase(PPO)activity were studied by using dark chamber and bulk curing barn with K326 as the control. The results showed that:(1)The lower tobacco leaves of HN2146 turned yellow completely at 36 h,which was 12 h earlier than that of K326. The browning of the two varieties began from the leaf tip and leaf edge,but the browning time of the lower leaves of HN2146 was 36 h earl...
