不同施氮量对烤烟磷积累以及磷肥利用率的影响

Study of Different Nitrogen for Phosphorus Accumulation of Flue-cured Tobacco and Utilization of Phosphorus

小区试验设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P2O578.8 kg.hm-2和K2O157.5 kg.hm-2,研究烤烟根茎叶磷积累以及磷肥利用率的变化。结果表明：根系3~7周为缓慢积累期,7~15周为快速积累期;茎在7~11周快速增加,11~15周保持稳定状态,磷的积累量随氮肥用量增加而增加;整个生育期内叶片磷积累表现为稳定增加的趋势,叶片磷积累量随氮肥用量增加而增加;磷肥利用率为10.02%和11.74%,氮肥用量对磷肥利用率影响差异不明显。

To study phosphorus accumulation in roots,stem,leaf of flue-cured tobacco and utilization of phosphorus of flue-cured tobacco on chernozem,the experiment with three different nitrogen application of 0,52.5,and 67.5 kg·hm-2 was conducted.The results showed that：in root,the first 3～7 weeks was slow accumulation stage,7～15 weeks was the rapid accumulation stage;in stem,a rapid increase in 7～11 weeks,11～15 weeks keep stable,phosphorus accumulation was increased with nitrogen increasing.Phosphorus accumulation in leaves trended to stable increase,and always maintain N2 N1 N0;Phosphorus use efficiency increased gradually,were 10.02% and 1.74% in tobacco leaf harvested,the amount of nitrogen had no effected on phosphorus use efficiency.