不同双棚管理对烟草漂浮育苗生长发育的影响

研究了不同双棚管理措施下的烟苗生长发育差异及影响因素,结果表明:双棚措施可以明显提升烟苗的成苗素质;与对照相比,双棚揭膜的烟苗素质较好,双棚不揭膜对烟苗茎杆部位的发育有一定抑制作用,并影响了磷素在烟苗叶片中的积累;双棚不揭膜对盘面气温和基质温度的提升更为明显,但会导致盘面气温过高,并降低盘面光照强度;双棚揭膜提高了棚内夜间温度,但在白天揭膜后会出现盘面气温和基质温度低于对照的现象;双棚揭膜的环境温度变化更为平稳,昼夜温差更小.在生产中,建议对双棚进行合理管理,不能一直关闭小棚,须适时揭膜,才能发挥双棚的作用.

Effects of different management of double-decked awning on growth and development in tobacco seedling with float system

The effects of different management of double-decked awning on the growth and development in tobacco seedling with float system were researched. The results showed that double-decked awning with covered membrane inhibited the development of stem and the accumulation of phosphorus in the leaves, raised surface temperature of the tray to the best level, and reduced the light intensity on surface of the tray; double-decked awning with uncovered membrane improved the quality of seedling more significantly and reduced temperature at daytime to keep the change of environmental temperature smoothly, it was the suggested management in application.