关键词: 烤烟, 氮水平, 钼, 生理特性, 品质

Abstract: This paper took Yuyan 12 as experiment material and studied the effects of spraying Mo under different nitrogen levels on physiological characteristics and quality of flue-cured tobacco. The results showed that under different nitrogen levels, spraying Mo had different results. Spraying Mo under low nitrogen levels had unconspicuous promotion role on the biomass of each growing stage & chlorophyll a, chlorophyll b, chlorophyll a +b and carotenoids contents. Spraying Mo under medium and high nitrogen levels could significantly increase dry weight of flue-cured tobacco both underground and overground, and contents of chlorophyll a, chlorophyll b, chlorophyll a +b and carotenoids in early growing stage. The increase of NR content and decrease of NO-3-N content with spraying Mo during late growing stage would become more sever along with the increase of nitrogen levels. Spraying Mo under different nitrogen levels could obviously increase Mo contents and Mo accumulation rate, which showed the rule of increasing first and then reducing during the whole growing period. Spraying Mo under low nitrogen levels could significantly increase sugar and potassium contents, reduce nicotine content, and improve coordinate ability of chemical component. Spraying Mo under medium nitrogen level, the differences of various chemical component were not distinguish. Spraying Mo under high nitrogen levels could significantly reduce the sugar(total and reduced) contents, sugar and nicotine ratio, potassium and chloride rate and significantly increase the contents of total nitrogen, nicotine and protein.

Key words: flue-cured tobacco, nitrogen level, Mo, physiological characteristics, quality