为探索腐殖酸应用于烟草漂浮育苗的前景，改进烟草漂浮育苗基质提升烟苗品质，以‘K326’为材料，研究不同腐殖酸含量对烟苗生长及生理特性的影响。结果表明：（1）基质中添加腐殖酸能影响烟苗的生长发育，主要包括烟苗的茎高、生物量及根冠比，且腐殖酸促进烟苗生长的作用随着基质中腐殖酸含量的增加呈现先促进后抑制的作用。（2）基质中添加腐殖酸对烟苗的还苗期时间影响较小，但能显著影响烟苗的移栽成活率，以30%的腐殖酸含量下烟苗的还苗期最短，且移栽后的成活率最高。（3）基质中添加腐殖酸能一定程度影响烟苗的叶绿素含量、硝酸还原酶活性、转化酶活性及根系活力的大小，且以腐殖酸含量为30%的处理烟苗生理特性各指标较适宜。综合来看，育苗基质中添加腐殖酸能影响烟苗的品质，适宜的腐殖酸含量能显著提高烟苗的整体品质，基质中最适宜的腐殖酸含量为30%。
Abstract
To explore the prospect of the application of humic acid in floating system for flue-cured tobacco seedling, and to improve the substrate for enhance the tobacco seedling quality, the effects of different amounts of humic acids on the growth and physiological properties of tobacco seedling were studied by the using of ‘K326’as the material. The results showed that: (1) the application of humic acid in substrate could affect the growth and development of tobacco seedling, which including the stem height, biomass and root shoot ratio of tobacco seedling, and the effect of on the growth of tobacco seedling was increased in the first and the inhibition with the rise of humic acid amount. (2) There was a little affect of application of humic acid on the green stage, but application of humic acid could significantly influence the survival rate of transplanting seedling, and the green stage was the shortest time and the highest survival rate of transplanting seedling when application 30% of humic acid. (3) The application of humic acid in the substrate could affect the value of seedling chlorophyll content, nitrate reductase activity, invertase activity and root activity of the tobacco seedling, and the physiological properties of tobacco seedling were more suitable when the content of humic acid at 30% level. In summary, tobacco seedling quality could be affected by application of humic acid, and the suitable humic acid content could significantly improve the seedling, 30% of humic acid content was the most suitable amount.
关键词
基质；烟苗品质；腐殖酸；生理特性
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Key words
substrate; seedling quality; humic acid; physiological properties
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