施钾水平对烟叶含钾量的影响

通过盆栽试验，采用定位叶片的方法，进行不同钾肥用量试验，研究了增施钾肥对石灰性土壤上烤烟吸钾和土壤供钾的影响及提高石灰性土壤上烤烟含钾量的可能途径。结果表明，增施钾肥可以显著提高烟叶含钾量；而当施钾量达一定水平时，只有大幅度增加钾肥施用量，烟叶含钾量才显著增加，但对烟叶产量影响不大。施钾对烟叶含钾量的提高作用在生育后期最为显著。保证生育后期充足的钾素供应对提高烟叶含钾量可能具有重要意义。

Effect of Different Potassium Fertilizer Application Levels on Potassium Content in Flue cured Tobacco Leaves

The pot experiment treated with different potassium levels was conducted in this paper,the effect of applying potassium fertilizer on potassium content of flue-cured tobacco leaves and soil potassium supply in limy soil were also studied.The possible way to increase potassium content of flue-cured tobacco was discussed.The study demonstrated that adding potassium fertilizer may significantly increase potassium content of tobacco leaves,especially the content in middle and upper leaves.When the amount of pot assium fertilizer reached a higher level,the yield of tobacco didn''t increase with the adding of the potassium fertilizer,potassium content in tobacco leaves also didn''t significantly increase unless the potassium fertilizer were applied more greatly.The effect on heightening the potassium content of leaves was significant in the later period of growth after the potassium fertilizer was applied more.It should be very important to apply enough potassium fertilizer in the later period of growth.