不同施氮水平对烤烟干物质积累分配及产质的影响

研究了黑钙土不同施氮水平下,烤烟干物质的积累以及分配规律。结果表明：黑钙土上烤烟的干物质积累随施氮量的增加而增加,且主要在旺长期内完成;而干物质在根、茎、叶的分配比例受施氮量的影响较小,虽各处理之间无明显规律,但均表现为叶＆gt;茎＆gt;根;根、茎、叶干重最终占烟株干重的比例分别为18.6%-19.7%,28.1%-29.3%和79.8%-81.8%;研究还表明过低的施氮量也不利于烤烟经济效益的提高,因此建议施氮量控制在52.5-67.5 kg.hm^-2之间比较好。

Effect of Different Nitrogen Levels on Yield,Quality,Dry Matter Accumulation and Distribution of Flue-cured Tobacco

The results from the field test in 2008 showed that dry matter accumulation of flue-cured tobacco was mainly completed in vigorous growth stage and increased with the enhance of nitrogen fertilizer.The proportion of distribution of dry matter in root,stem,leaves was leaves > stem > root,but was affected slightly by nitrogen levels and showed no apparent law among the different treatments.The final proportion of dry matter of root,stem and leaves in plant was18.6%～19.7%,28.1%～29.3% and 79.8%～81.8%.The results also indicated that low nitrogen fertilizer was no good for the economic benefits increasing,so the better nitrogen fertilizer level was between 52.5 kg·hm~(-2) and 67.5 kg·hm~(-2) was suggested.