駁枝及追施氮肥對烤煙主脈化學(xué)成分的影響

Effects of Branching-after-topping and Nitrogen Dressing on Chemical Components in Midribs of Flue-cured Tobacco Leaves

摘要: 為研究駁枝方式及追施氮肥用量對烤煙主脈化學(xué)成分的影響并確定駁枝后適宜的施氮量,，通過田間試驗對K326的早花煙株進(jìn)行處理,。結(jié)果顯示，成熟期高位駁枝主脈葉綠素含量低,，更易落黃成熟,；低位駁枝各追氮處理降低中,、上部葉主脈中煙堿及淀粉含量。建議當(dāng)?shù)夭捎米肥┑?5 kg/hm2,，以降低生產(chǎn)成本,，提高煙葉品質(zhì)和安全性。

Abstract: A field experiment was carried out with early flowering K326 plants to study the effects of different branching-after-topping treatments and various dressing rates of nitrogen on chemical components of flue-cured tobacco midribs, and determine the optimum nitrogen dressing rate. The results showed that branching at higher leaf position in maturity stage might result in lower level of chlorophyll in midribs, and much easier yellowing of tobacco leaves. While branching at lower leaf position with different nitrogen dressing level could reduce the contents of nicotine and starch in midribs of middle and upper leaves. The nitrogen dressing level of 15 kg / ha is recommented to meet the requirement of reducing production costs and improving tobacco leaf quality and safety.