Effeacts of Steam-exploded Tobacco Stalk Substitute Medium on Tobacco Seedlings in Floating System

To study effects of steam-exploded tobacco stalk substitute medium on tobacco seedlings, the seedling test on steam-exploded tobacco stalk substitute medium was conducted. The results showed that there were no significant difference in germination rate, stem girth, root number, root fresh and dry weight, chlorophyll content, root activity, or activities of peroxidase (POD) and superoxide dismutase (SOD) between treatments.Planting percentage was higher, and stem height, leaf number and aboveground fresh and dry weight were better than the control. Cost of the substitute medium was 11.88-47.71yuan/hm², lower than the control. In conclusion, steam-exploded tobacco stalk can substitute commercial medium in tobacco floating system.