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为进一步完善烟草漂浮育苗方法,采用自主研发的新型通气苗盘进行了烟草漂浮育苗试验,并以普通苗盘为对照,研究了新型通气苗盘对烟苗出苗率、植物学性状以及保护酶和硝酸还原酶活性的影响.结果表明:新型通气苗盘培育的烟苗较对照烟苗的成苗周期缩短5 d,出苗率提高3.67%;烟苗的叶片大小、根系发育及综合长势均优于对照且存在显著差异;根系活力在播种后35、45和55 d较对照分别提高了14.26%、20.45%和19.31%;叶绿素含量(质量分数),过氧化氢酶、过氧化物酶、超氧化物歧化酶和硝酸还原酶等酶活性也均有显著提高.因此,新型通气苗盘有明显促苗壮苗的效果.“,”To improve floating seedling system for tobacco, tobacco seedling culturing experiments were conducted in a floating system with in-house designed novel ventilated seedling tray. By taking common seedling tray as a control, the effects of ventilated seedling tray on the emergence rate, botanical characters and activities of protective enzymes and nitrate reductase (NR) of tobacco seedling were studied. The results showed that comparing with the control, the time of seedling culturing in the ventilated seedling tray was shortened by 5 d and emergence rate increased by 3.67%; the leaf size, root development and comprehensive growth of tobacco seedlings were significantly improved. On the 35th, 45th and 55th days after sowing, the root vigor of seedling increased by 14.26%, 20.45% and 19.31%, respectively; chlorophyll contents and the activities of catalase, peroxidase, superoxide dismutase and NR significantly increased comparing with the control. Therefore, the novel ventilated seedling tray has shown a clear promoting effect on seedling growth.