中文摘要：

考察常规漂浮育苗、浅水漂浮育苗、湿润育苗、晾盘和池底发酵增温漂浮育苗几种方式对白肋烟烟苗生长及生理生化指标的影响。结果表明：湿润育苗的池水温度比常规漂浮育苗增加4.5℃,晾盘处理的基质温度比常规漂浮育苗提高1.99℃;浅水3 cm漂浮育苗和晾盘处理的苗床期比常规漂浮育苗缩短7 d和6 d;猫耳期,湿润育苗的叶片数和最大叶长、宽优于其他育苗方式,晾盘处理烟苗的一级侧根和二级侧根条数显著优于其他育苗方式;成苗期,各处理间及处理与对照间烟苗的叶片数、一级侧根数、地上和地下部干重、叶绿素含量、根系活力和SOD活性无统计学意义,池底发酵增温漂浮育苗烟苗的地上部鲜重优于其他育苗方式,晾盘处理烟苗的二级侧根数、地下部鲜重、硝酸还原酶活性和壮苗率优于其他育苗方式;浅水漂浮育苗和常规漂浮育苗的成本最低,为696元/hm^2,池底发酵增温漂浮育苗的成本最高,较常规漂浮育苗增加576元/hm^2。

英文摘要：

The effects of different seedling ways（normal floating system, shallow water floating system, seedling nursing on moist trays, plate airing and seedbed fermentation floating system） on the growth and physiological and biochemical indexes of burley tobacco were observed. The results showed thatcompared to the normal floating way, the water temperature was raised by 4.5 ℃ with seedling nursing on moist trays, the media temperature was raised by 1.99 ℃ with plate airing, and the seedbed period wasshortened by 7 days with 3 cm shallow water and 6 dayswith plate airing. In root period, compared to other seedling ways, the number of leaves and max leaf length and width of tobacco seedlings nursing on moist trays were better, the number of lateral roots and secondary lateral roots of tobacco seedlings with plate airing were significantly superior. In seedling period, there was no significant difference onnumber of leaves and secondary root, above-and below-ground dry weight, chlorophyll content, and root activity and SOD activity of tobacco seedlings among different seedling ways; theaboveground fresh weight of tobacco seedlings with seedbed fermentation was superior to those with other seedling ways; the number of secondary lateral roots, underground fresh weight, nitrate reductase activity and seedling rate of tobacco seedlings were superior to those with other seedling ways. The cost of seedling using shallow water floating and normal floating were the lowest, whichwas 696 Yuan/hm^2, and seedlingcost using seedbed fermentation was the highest, which increased by 576 Yuan/hm^2 compared to normal floating.