不同苗龄移栽对K326品种田间表现、化学成分及经济性状的影响

The Effect of Transplanting at Different Seedling Ages on Field Performance,Chemical Constituents and Economic Characters of Flue-cured Tobacco Variety K326

[目的]探索不同苗龄对烤烟烟苗生长发育特性及烤烟产质量的影响.[方法]在罗平县设立1个试验点,分别以播种后80、70、60、50 d的烟苗为试验材料,对生育期、农艺性状、田间发病率、经济性状和化学品质等指标进行分析.[结果]结果表明,随着烟苗苗龄的缩短,全生育期天数变短,移栽后烟苗成活率下降,除有效叶片数外,株高、茎围、叶面积均显著降低,发病率显著升高且易感花叶病,经济性状呈先升高后降低的趋势,化学成分中总氮、烟碱含量降低,氯含量呈先降低后升高的趋势,钾含量、还原糖含量、化学成分协调性均呈先升高后降低的趋势.[结论]罗平县适宜的烟苗苗龄为60～70 d,建议根据当地移栽节令选择合理的育苗时间,以满足当地的烟苗移栽需求.

[ Objective ] The aim was to explore the influence of transplanting at different seedling ages on growth yield and quality of local fluecured tobacco. [ Method] One test point had been set up in Luoping and a series indexes of tobacco seedlings transplanted 80, 70, 60, 50 days after sowing were measured, such as growth period, agronomic field morbidity, economic traits and chemical quality. [ Result ] The results showed that as seedling age getting shorter, the whole growth period got shorter; survival rate declined; the plant height, stem girth, leaf area except the effective leave numbers were all significantly reduced; the incidence of mosaic disease susceptibility significantly increased; economic traits increased first and then decreased; total nitrogen and nicotine decreased; chlorine content, potassium content, sugar content, the chemical composition harmonious were all increased fist and then decreased. [ Conclusion] Therefore, the most suitable tobacco seedling age is 60 - 70 days in Luoping, and it is recommended to select a reasonable time according to the local nursery transplanting seasons, in order to meet the needs of the regiong tobacco seedling transplanting.