不同施氮水平对烤烟干物质、氮素积累分配及产质的影响

研究了不同施氮水平下 ,烤烟干物质和氮素的积累分配等 ,结果表明 :烤烟的干物质、氮素积累随施氮量的增加而增加 ,且主要在旺长期完成 ;干物质与氮素在根、茎、叶的分配比例受施氮量的影响较小 ,各处理之间无明显规律 ,但均表现为叶 >茎 >根 ;根、茎、叶干重占烟株干重的比例最终分别为 1 2 %～ 2 1 % ,2 3%～ 2 6%和 5 4 %～ 65 % ,根、茎、叶的氮积累量占烟株氮积累量的比例最终分别为 1 2 %～ 1 9% ,2 0 %～ 2 6%和 5 8%～ 67% ;施氮处理中 ,以每公顷施纯N 97.5kg处理的经济效益最好

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

The results from the field test in 2002 showed that accumulation of dry matter and nitrogen 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 and nitrogen in root,stem,leaves was leaves>stem>root, but was affected slightly by nitrogen levels and showed no apparent law;among the different treaments.The final proportion of dry matter of root,stem and leaves in plant was 12%-21%,23%-26% and 54%-65%, and the final proportion of nitrogen accumulation of root,stem and leaves in plant was 12%-19%,20%-26% and 58%-67%;In treatments of nitrogen application,the economic benefits of treatment of 97.5 kg/ha was best.