Effects of different transplanting dates and seedling ages on yield and quality of flue-cured tobacco under well-cellar transplanting

The effects of different transplanting dates and seedling ages on yield and quality of flue-cured tobacco Yunyan 87 by well-cellar transplanting were studied by using a two-factor split-plot experiment. The results showed that: in the aspects of yield，production value，average price and first class leaves rate，the best performance appeared in the A2 and A3 treatments，the poor performance was the earlier transplanting of A1 treatment. The contents of nicotine，nitrogen and potassium and the ratios between sugar and nicotine，nitrogen and nicotine， potassium and chlorine of A2 treatment were all moderate，and the chemical coordination evaluation value was 96.26. The chemical coordination evaluation value of A1 and A3 was more than 90，slightly worse than that of A2. In the aspects of yield，production value，average price and first class leaves rate，the best performance appeared in the B2 seedling age treatment. The nicotine and nitrogen contents of B1 were on the low side，while its reducing sugar content was on the high side，and its chemical coordination evaluation value was only 89.13. The chemical coordination evaluation value of B2 and B3 was more than 90. So in order to increase the production and improve the quality of tobacco leaf，the suitable well-cellar transplanting date should be around March 1st，and the seedling age should be at about 55 d under Ganzhou ecological and climatic conditions.