不同施氮量的烤烟烟叶大田生长期碳水化合物的变化

 通过对烤烟品种红花大金元(简称“HD”)和K326的3个施氮量大田生长期烟叶中的碳水化合物的研究得出如下结论:2个品种移栽后不同施氮量、不同部位的烟叶可溶性总糖含量逐渐增加,移栽后72 d含量达到最高,然后迅速下降,82 d以后到成熟其含量趋于稳定。2个品种烟叶中的还原糖含量的变化规律与可溶性总糖的变化规律一致。移栽后两个品种各施氮量处理中部、上部烟叶的淀粉含量在42 d（下部叶在32 d） 出现一个高峰,移栽后60 d淀粉含量有所下降,以后迅速上升,72 d以后上升趋势趋于平缓。下部叶淀粉含量移栽后82 d达到高峰,以后随烟叶衰老淀粉含量下降。不同施氮量对可溶性总糖、还原糖和淀粉含量没有显著影响。

Changes of Carbohydrate Content in Flue-cured Tobacco Leaves with Different Levels of Nitrogen Applied during Growth Phase

In this paper changes of carbohydrate content in two tobacco cultivars leaves (K326 and HD) with three different levels of nitrogen applied was studied during field growth phase. Total soluble sugar increased gradually in two cultivars leaves with different nitrogen levels and different stalk positions after tobacco seeds being transplanted. It reached a maximal content on the 72nd, and then decreased rapidly. There was a stable stage from the 82nd to the mature. Changes of reducing sugar content in two cultivar's leaves are the same with total soluble sugar content. The maximal starch content in two cultivars appears in middle and upper leaf on the 42nd, but on the 32nd in the lower leaf after being transplanted, which decreased a little on the 60th, then increased rapidly. There is a slow increasing after the 72nd day. The starch reached the maximal content in two cultivars' leaves on the 82nd, and then decreased with the leaf dextral maturity. There are no significance effects on the contents of total soluble sugar, reducing sugar and starch with different levels of nitrogen applied.