施钾对烤烟叶片氮素含量影响的研究

本文系统研究了钾肥的施用量和施用方法对烤烟生长中后期烟叶氮素含量的影响。结果表明：烤烟生长中后期氮素含量均呈显著下降的趋势，其下降幅度随叶位和基施钾肥量而发生变化；充足的钾肥作为基肥能显著提高烤烟叶片中氮素的含量。追施钾肥可提高烤烟叶片含氮量，提高的幅度与钾肥的追施量有关；但随生育期的延长，只有大量追施钾肥才能提高烤烟叶片含氮量。喷施钾肥可不同程度的提高叶片的含氮量，但随生育期的延长叶片含氮量的差异逐渐变小。施钾均能降低烤烟叶片的N／K2O比值，但对下位叶的影响较大。

THE EFFECTS OF K FERTILIZING ON N CONTENTS IN TOBACCO LEAVES

The effects of K fertilizer, on N content in Tobacco leaves are studied. The results show: N contents in Tobacco leaves appear significantly decreasing when K ferfilizers were added in the middle and Later grouth periods. The decreasing range is related to tobacco leaf position and amount of K base fertilizer. If abundant K fertilizer is applied in basic fertilizer form, it can increase N contents. With dressing K fertilizer in middle period, the N contents increase in tobacco leaves only can keep short period; but it may improve in harvest as long as higher amount of dressing K fertilizers. Spraying K 2SO 4 can N Tobacco leaves, but it may be no difference in harvest. K fertilizer can decrease ratio of N/K 2O.