施氮量和留叶数对烤烟根系活力与氮磷钾含量的影响

Effect of Nitrogen Application Rate and Remained Leaf Number on Root Activity and Content of N,P and K of Flue-cured Tobacco

以烤烟品种HY-9-7为材料进行大田试验,研究了施氮量和留叶数对烤烟根系活力与烟株各器官氮、磷、钾含量的影响。结果表明,烤烟生长发育前期,根系活力随施氮量增加而升高;烤烟生长发育后期,同一留叶数条件下,根系活力随施氮量增加呈先升后降趋势;同一施氮量水平下,根系活力随留叶数增加呈先升后降趋势。烟株各器官含N量随施氮量增加而增加,叶、茎含P量与叶、根含K量随着施氮量增加呈先升后降趋势;同一施氮量水平下,叶、根含P量随留叶数增加呈先升后降趋势,各器官含N量随留叶数增加而降低,叶、根含K量随留叶数增加而升高。

In order to study the influence of nitrogen applied rate and remained leaf numbers on tobacco root activity and N, P, K content in tobacco plant organs, we used tobacco variety HY -9 -7 as experiment material. The results showed that the root activity increased with nitrogen applied rate increased at the early growth stage of tobacco. At the late growth stage, root activity increased with the nitrogen applied rate increased under the same remained leaf numbers, and it showed increase - decrease trend with the remained leaf numbers increased under the same nitrogen applied rate. With the nitrogen applied rate increase, nitrogen content in different organs was increased, while P content in leaves and stems, and K content in leaves and roots showed increase - decrease trend. Under the same nitrogen applied rate, with the increased of remained leaf numbers, nitrogen content in different organs decreased, K content in leaves and roots increased, while P content in leaves and roots showed increase -decrease trend.