不同火土灰用量对烟苗生长发育的影响

为明确火土灰对烟苗生长发育的影响,采用漂浮育苗的方式,研究不同含量火土灰育苗基质对烟苗叶绿素含量、根系构型、根系活力及硝酸还原酶活性的影响。结果表明,随育苗基质中火土灰比例升高烟苗叶绿素含量、总根长、根总表面积、根平均直径、根体积和根系活力呈现先升高后降低趋势,在50%火土灰+50%常规育苗基质处理条件下达到峰值;根系硝酸还原酶活性随基质中火土灰用量增加呈增加趋势;育苗基质中火土灰用量在50%以内时,火土灰用量与总根长、根总表面积极显著正相关,与根总体积显著正相关。可见,50%的火土灰和50%的常规育苗基质配比最有助于促进烟苗生长发育。

Effects of Different Amounts of Fired Soil on Development of Tobacco Seedlings

In order to clarify the influence of fired soil on the quality of tobacco seedlings,the floating seedling breeding method was adopted to study different amounts of fired soil seedling substrates on chlorophyll,root architecture,root activity and nitrate reductase activity of tobacco seedlings.The results showed that,the chlorophyll,total root length,root surface area,root mean diameter,root volume and root activity increased at first and then decreased,and reached peak under 50% fired soil with 50% conventional seedling substrates treatment;The root nitrate reductase activity increased with the increase of the amount of fired soil;When the proportion of fired soil was within 50%,the amount of fired soil was positively correlated with total root length and root surface area at the 0.01 level,and was positively correlated with total root volume at the 0.05 level.It was concluded that 50% fired soil together with 50% conventional seedling substrate was the best for the development of tobacco seedlings.