Internal factors,environmental factors and agronomic measures are the most important factors which determine the content of nicotine in tobacco plant. To a large extent,internal factors play decisive role in synthesis and accumulation of nicotine,agronomic measures can obviously change the distribution of nicotine in different leaf positions,and environmental factors influence the nicotine formation by the interaction with internal and external factors. This article summarized the related studies on the influencing factors and the...
