【作者】 李旭；

【导师】 朱列书； 彭德元；

【作者基本信息】 湖南农业大学 ， 农业推广硕士（专业学位）， 2016， 硕士

【摘要】 在湘西生态条件下设置不同的种植密度和氮肥水平,创建不同群体结构模式,研究烟株特体发育特征,群体发展动态和烟叶产、质量的关系。试验结果表明：(1)施氮量的增加对烤烟最大叶长、最大叶宽、茎围影响显著。施氮量增加时烟叶最大叶片长宽呈增加趋势,但过大的施氮量将促使烟叶主脉变粗,烟叶含梗率增加。烤烟K326烟叶总氮和烟碱含量受施氮量影响最大,二者随着施氮量的增加而增加。适量的施氮量能一定程度有效改善烟叶品质,但施氮量过大时,烟叶成熟度难以掌握。本研究中,施氮量7.0kg/667m2能获得较高产值和产量,能具有较好的农艺性状、物理性状和内在化学成分的协调性；(2)种植密度对烟株生长发育影响最大,这可能是由于烟株对肥料需求量大,而种植密度决定了单株的分配量。适量增加种植密度能有效降低烟叶烟碱和总氮含量,总糖、还原糖含量随着种植密度的增加呈增加趋势,但种植密度过大时,氯含量明显降低。产量、均价、产值随着种植密度的增加呈先增后减的趋势,这说明过大的种植密度不利于K326烟叶种植。本试验结果表明：施氮量7.0kg/667m2+当种植密度为1212株/667m2时,烟叶田间长势好而齐；烟叶物理特性适中,化学成分协调,各项指标符合烟叶优质生产,为K326于桑植烟区适宜的种植密度。更多还原

【Abstract】 In Xiangxi ecological conditions set different planting density and nitrogen application, research development characteristics of flue-tobacco, community development and the relationship between the output and quality of tobacco leaves of creating different population structure mode, The experiment result indicated that:(1)The nitrogen application rate has obvious influence on growing development of K326.The length and width of leaf will increase if the nitrogen application rate increased,but high nitrogen application will promote coarsens the tobacco leaf venation,stem percentage of leaf will increase.The total nitrogen and nicotine increase the nitrogen application rate. Suitable nitrogen application rate to the benefit on the character of tobacco.In this research, the output value and yield of tobacco leaves with nitrogen application of 7.0kg/667m2 were the highest. The planting density of for tobacco was able to obtain better growth chemical compositions. (2) The largest effects of plant population on growing development of K326 was the peak period,this may be due to tobacco need vast fertilizer in this time. Duly increase the plant population can reduce the total nitrogen and nicotine of tobacco leaf. But the soluble nitrogen compounds ratio was poor performance when the plant population overdose, the chlorine content decreased obviously.In this research, when the plant population of K326 was 1212plants per 667m2,all of the chemical properties and yield performance was the best. This plant population was the best one of K326plant in Sangzhi.更多还原