【摘要】 与不打顶相比 ,打顶并未增加烟株最终的干物质及K累积量 ,但由于消除了顶端对有机物质及K的强烈竞争 ,使无谓消耗于顶中约 1 / 3的同化物及K运向其它器官 ,从而使叶片中累积的同化物及K由不打顶时的 1 / 3左右提高到 1 / 2左右 ,有利于同化产物及K在叶内的累积 ;此外打顶还提高了根对同化产物的竞争能力 ,因而根系发达、烟叶产量及其含K量显著增加 .打顶后用NAA处理茎断口并不能提高烟叶产量 ,但烟株及烟叶内K的最终累积量增加 ,因此与仅打顶相比可明显提高生育后期叶片K含量更多还原

【Abstract】 Compared with intact plants, decapitation did not cause increase in dry weight of tobacco plant and in potassium accumulation 8 weeks after the treatment. In intact plants, about 1/3 of assimilation and potassium were transported into the top, and only about 1/3 of those deposited in the leaves. Decapitation resulted in about 1/2 of assimilation and potassium distributing in the leaves, so it was more effective. Application of NAA on the stump of the stem did not influence leaves yields, but accumulation of potassium in the upper and middle leaves was enhanced.更多还原