Tobacco (Nicotiana tabacum L.) ,which belongs to Nicotiana、Solanaceae and derives from America Oceania and south Pacific islands, was introduced into China in the Ming Dynasty Wanli and now contains about 66 species. It is a warm-season crop, ceasing growth at 10~13℃ and perishing at 2℃. The optimum temperature for the growth of seedlings is 24℃C, and the fast growing temperature is at 25~28℃. While temperature above 35℃ will do harm to the seedlings. Average tempetature should be better at 24~25℃ in matura...
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