一种烟草专用促根剂对烤烟根系生长的影响

摘要

如何促进烤烟根系发育在烟叶生产中一直备受关注。本研究探讨了一种烟草专用促根剂对烤烟根系生长的影响。结果发现，移栽时促根剂灌穴施肥方式对根系生长的促进作用显著高于灌根和蘸根方式。在烤烟移栽后45 d内，促根剂灌根能明显促进烤烟生根和根系生物量的增加。与等量NPK对照相比，烟草专用促根剂能缩短移栽后烤烟还苗期28 h，烤烟总根数增加18.3%，根系干重增加25%，并且烤烟氮磷钾的吸收量增加28.3%～50.3%，利用率分别提高2.9%、2.7%和4.8%。烟草专用促根剂是通过增加烤烟二级侧根的数量促进根系生长和养分吸收的，其二级侧根数量比等量 NPK 处理增加了36.6%。因此，此种烟草专用促根剂对促进烤烟根系生长、提高养分利用率具有重要意义。%　　It is a critical in tobacco production to enhance the growth of tobacco roots. In this study, a specific tobacco root-promoting agent (STRPA) was tested to investigate its effect on root growth of tobacco seedlings. The results indicated that the root-promoting effects were different when the agent was applied in different ways. The root-promoting effects of irrigating cave was better than irrigating root layer or dipping roots. The root-promoting agent could enhance growth of roots and root biomass of tobacco significantly within 45 d after transplanting. Compared with the equal NPK application, treatment with STRPA could shorten the time of seedling development by 28 hours, and increase the total root number and root dry weight by 18.3% and 25%, respectively, and also enhance N, P and K uptake by 28.3%-50.3%. N, P and K utilization efficiency were improved by 2.9%, 2.7%and 4.8%. Besides, it was found that STRPA promoted root growth and absorption of nutrients through increasing the number of 2nd lateral root, which increased by 36.6%when compared with the equal NPK. These results suggested that STRPA application play an important role in enhancing root development and increasing fertilizer uptake efficiency.