土壤酸度的调节对烤烟根系生长与烟叶化学成分含量的影响

Effects of soil acidity adjustment on root growth and chemical compositions of the cured leaves in flue-cured tobacco.

采用盆栽试验研究施石灰调节土壤酸度对烤烟生长和烟叶化学成分含量影响的结果表明,土壤pH值从5.0调节至5.5～6.6,能明显促进根系生长和烤烟对N、P、K元素的吸收,提高N、P、K肥料利用率,土壤pH值调节在7.0以上,根系生长受抑制。随土壤pH值增加,烟碱、总N、Ca含量增加,总糖、Mg、Mn、Zn、Cu和B含量下降,K含量变化不大。土壤pH值调节至5.6～6.6,烤后烟叶各化学成分含量较适中,品质较好。酸性土壤施石灰要注意配施适量的Mg肥和微肥。

The results from pot experiments show that when soil pH value is adjusted to 5. 5 - 6. 6 from 5.0, root growth is improved, and the absorption of N, P, K is accelerated. When soil pH value>7.0, root growth is inhibited. With the increase of the soil pH value, the contents of total nitrogen, nicotine and Ca in cured leaves increase, the contents of total sugar, Mg, Mn, Zn, Cu and B decrease, the content of potassium is nearly not varied. When soil pH value is raised to 5.5 - 6.6 by lime application, the contents of various chemical compositions are rational in cured leaves, the quality of leave is better. It is better for the acid soil to apply lime together with an appropriate amount of magnesium and micro-elements.