打頂時(shí)期對(duì)烤煙根系活力及煙堿積累規(guī)律的影響
Effect of different topping time on activity of root system and accumulation of nicotine in tobacco plants
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摘要: 對(duì)不同打頂時(shí)期烤煙根系活力及煙堿積累規(guī)律進(jìn)行了研究。結(jié)果表明,，根系活力和根系煙堿含量呈顯著的正相關(guān)關(guān)系,。根系活力和根系煙堿含量均隨打頂時(shí)期的推遲增加幅度降低，且增至最高值后下降較快,。打頂時(shí)期與烤煙中上部葉煙堿含量有顯著的負(fù)相關(guān)關(guān)系,。中部葉煙堿含量以扣心打頂處理最高，煙堿積累強(qiáng)度高峰均出現(xiàn)在打頂后20 d 前后。上部葉煙堿積累強(qiáng)度高峰均出現(xiàn)在移栽后80 d,，且隨打頂時(shí)期推遲煙堿積累強(qiáng)度高峰依次下降，煙堿含量也依次降低,，每推遲一天打頂煙堿含量就下降0.0504%,。Abstract: The experiment was conducted to study the activity of root system and the regulation of nicotine accumulation at different topping time on cinnamon soil in Xuchang, Henan Province in 2005. The activity of root system was significantly positively related to nicotine level. As the topping time delayed, the activity of root system and nicotine level increased slowly and declined rapidly from the peak value. The topping time was significantly negatively related to nicotine level in middle and upper leaves. The highest nicotine level in middle leaves appeared with topping on early button period and the highest rate of nicotine accumulation occurred about 20 days after topping. The highest rate of nicotine accumulation in upper leaves occurred 80 days after transplanting，and declined gradually with topping stage delayed. Nicotine level also declined gradually, 0.0504 percent with delaying one day.
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