群体密度与留叶数对湘西山地烟叶品质的影响

为探明湘西山地优质烤烟生产与群体密度及留叶数的关系,以K326为参试品种,采用大田试验方法研究栽培密度和留叶数对烤烟农艺性状及化学成分的影响。结果表明:密度及留叶数对烟株田间农艺性状有显著影响,密度及留叶数对烤烟的化学成分影响较大,留叶数为20片时,烤烟各部位叶片的总糖和还原糖含量随密度的增加而增加,糖碱比也随密度增加而增加。在密度为18 518株/hm~2时糖碱比最高,为16.28,化学成分协调,质量最好。在密度为18 518株/hm~2,行株距为120cm×45cm,每株留20片叶的群体结构较为适合湖南湘西烟区烟叶的生产。

Effect of Population Density and Remained Leaf Number on Quality of Flue-cured Tobacco in Mountainous Area of Western Hunan

The effects of planting density and remained leaf number on agronomic traits and chemical composition of K326, a flue-cured tobacco variety, are studied by a field test to discuss the relationships between quality flue-cured tobacco production and population density, remained leaf number in mountainous area of Western Hunan.Results: The planting density and remained leaf number have the significant influence on agronomic traits of flue-cured tobacco plants and the great influence on chemical composition of flue-cured tobacco plants.The total sugar, reducing sugar content and sugar/nicotine ratio of flue-cured tobacco leaves with different position increase with increase of planting density when the remained leaf number is 20.The sugar/nicotine ratio of flue-cured tobacco leaves is the highest (16.28) when the planting density is 18 518 plants/hm2 and its chemical composition harmony and leaf quality are the best among all treatments.The population structure including 18 518 plants/hm2 of planting density, 120 cm×45 cm of row spacing and 20 remained leaves is suitable for flue-cured tobacco production in flue-cured tobacco-growing area of Western Hunan.