不同施氮量对烤烟钾素积累、分配及利用率的影响研究

为研究不同施氮量对于烤烟钾积累、分配和钾肥利用率的影响,于黑钙土设3个施氮处理分别为0、52.5和67.5 kg·hm-2,磷钾肥用量分别为90 kg·hm-2 P2O5和157.5 kg·hm-2 K2O,研究了钾在生长期内积累,分配以及钾肥利用率变化。试验结果表明:随生育期延长烤烟钾积累呈逐渐升高的趋势,施氮处理钾积累量明显高于对照,而施氮量不同钾积累量差异不大;根茎内钾的分配比例随烟株生长逐渐增加,而叶片内钾分配比例随生育期增加逐渐降低;钾肥利用率随生育期逐渐增加,钾的利用率在27.24%～30.63%之间。

Effect of Different Nitrogen Levels on Tobacco Potassium Accumulation Distribution and K Use Efficiency

To study effect of different content of nitrogen on flue accumulation,distribution and application rate of potassium fertilizer respectively set three N treatments 0,52.5 and 67.5 kg·hm-2,The application amount of P and K2O were 78.8 kg·hm-2 P2O5 and 157.5 kg·hm-2 K2O.The results showed that the total K accumulation showed with the growth period increased gradually changes,accumulation of nitrogen treatment was significantly higher than control,but there is no greater difference of different K2O in N1 and N2;roots and stem in the ratio of potassium gradually increased with the growth period,leaves decreased;application rate of potassium was increased gradually with the growth period,and the application rate of potassium is 27.24%～30.63%.