论文部分内容阅读
采用大田控水试验,分别将烟株生育前期烟田供水量控制为常规供水量的70%,50%和30%,研究了湘南烤烟生理特性对烟田不同水分条件的响应。结果表明:在按常规供水量的70%和50%供水条件下,烟株叶片发育、根系发育及综合长势明显优于对照;成熟期各处理的叶片超氧阴离子和过氧化氢均低于对照,叶绿素含量均高于对照;初始荧光(F0)略高于对照,而最大光化学效率(Fv/Fm)略低于对照。控水处理叶片的“日灼烟”现象显著减少,说明在湘南烟区气候条件下适当控制生育前期烟田的含水率有利于烟株的壮根壮苗和生长发育,可作为防控该烟区烟叶“高温逼熟”现象的有效措施之一。
Field water control experiments were conducted to control the water supply of tobacco plants at the early stage of tobacco growth to 70%, 50% and 30% of the conventional water supply respectively. The responses of the south Hunan flue-cured tobacco to different water conditions were studied. The results showed that under the 70% and 50% water supply conditions, leaf development, root development and overall growth of the tobacco plants were significantly better than those of the control. The superoxide anion and hydrogen peroxide in the leaf of the tobacco leaves at maturity were lower than those of the control , Chlorophyll content were higher than the control; initial fluorescence (F0) slightly higher than the control, and the maximum photochemical efficiency (Fv / Fm) slightly lower than the control. Controlled-water treatment leaves significantly reduce the “burning sun” phenomenon, indicating that the climate in southern Hunan tobacco area under the proper control of pre-harvest tobacco water is conducive to tobacco plant strong roots and strong growth and development, can be used as control One of the effective measures for the phenomenon of tobacco “high temperature ripening” in the tobacco area.