Studies On Accumulation Characteristics And Reducing Methods Of Nicotine Contents Of Flue-cured Tobacco

The experiment was conducted to study K326, a variety of flue-cured tobacco under two different quantities of pure nitrogen applied (7kg-666.7m-2, 9kg-666.7m-2), two different numbers of leaves remained (18 per plant, 20 per plant) and either sprinkling α-N A A of clean water. Thus, there were eight different treatments. They were arranged at random and repeated three times. All growing stages and agronomic characters were observed; Nicotine contents of fresh leaves and roots of different growing stages, fresh leaves of different stalk position and cured leaves of different grades were determined; Economic characters of all treats 'were analyzed by biostatistic methods. The results showed that the more days tobacco plants have grown since transplanting, the more nicotine contents of fresh leaves and roots; while at the same maturity, those were increased with the increasing of the stalk position. Variance analysis results showed that quantities of pure nitrogen applied , numbers of leaves remained and sprinkling a -NAA or not had great effects on economic characters and nicotine contents of cured leaves. Lowering the quantities of pure nitrogen applied; increasing the numbers of leaves remained, and sprinkling a -NAA all could decrease nicotine contents of tobacco plants. The yield, output value, Average price, high-quality ratio and high-middle-quality ratio of the treatment which applied pure nitrogen 9kg-666.7m-2, 20 leaves remained per plant and sprinkled a -NAA were highest; nicotine contents were moderate in all parts, which best satisfied the demand of prescription in cigarette industry.