不同氮素供应水平对烤烟苗期生长的影响  

Response of Flue-Cured Tobacco Seedling Growth at Different Nitrogen Levels

作　　者：罗维 李志伟 邱尧[2] 张涛 汤术开 李强 

机构地区：[1]川渝中烟工业有限责任公司,四川成都610017 [2]湖南农业大学烟草研究院,湖南长沙410128

出　　处：《湖南农业科学》2015年第1期74-76,80,共4页Hunan Agricultural Sciences

基　　金：川渝中烟工业有限责任公司项目[(2013)164-22]

摘　　要：试验采用砂培和营养液浇灌的方式,以烤烟品种K326为试验材料,研究了烤烟在营养生长阶段对不同氮素水平的响应。结果表明:提高氮素浓度能够促进烤烟干物质的积累,有利于地上部分的生长,降低根冠比;轻度缺氮可促进根系和茎部的生长,但氮素水平过高对根系的生长有抑制作用;在缺氮水平下,叶绿素含量逐渐下降,供应充足的氮素能提高叶绿素含量;硝酸还原酶活性和根系活力随氮素浓度的增加呈上升趋势;氮素供应水平与膜脂氧化程度有关,严重缺氮下,丙二醛含量大量积累,高氮供应则能降低膜脂氧化水平。In this experiment, a flue- cured tobacco variety K326 was used as material by sand culture and nutrient solution watering to study the response of flue-cured tobacco to different nitrogen levels at the vegetative growth stage. The results showed that the accumulation of dry matter of flue-cured tobacco increased with N concentration increasing, which was conducive to the growth of aboveground parts and reduced the root- shoot ratio; the growth of roots and stems was promoted under slight N deficiency, root growth was inhibited under excessive N levels; the chlorophyll content decreased at N deficiency level, the chlorophyll content increased under adequate supply of N; nitrate reductase activity and root activity rose with N concentration increasing; and the degree of oxidation of the membrane lipid was related to N supply level, the MDA content was massively accumulated under severe N deficiency, and the high N supply reduced the level of membrane lipid oxidation.

关 键 词：氮素水平 烤烟 响应 

分 类 号：S158[农业科学—土壤学]