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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
Topping did not increase the final dry matter and K accumulation of tobacco plants compared with no-topping, but eliminated the top competition for organic matter and K, making it unnecessary to consume about 1/3 of the top assimilates And K to other organs, so that the accumulation of leaves in the assimilation and K by the do not hit when about 1/3 up to about 1/2, is conducive to the accumulation of assimilation products and K in the leaves; also Top Increased the root competition for the assimilation product and developed the root system with a significant increase in the yield and K content of the leaf.After the top-hatch treatment with NAA did not improve the yield of tobacco, but the final accumulation of K in the tobacco and tobacco increased , So compared with only the top can significantly improve leaf K content during late growth stage