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标题：Using Plant Growth Regulators on Red Alder and Douglas-Fir Plugs
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作者：Nabil Khadduri
期刊名称：Tree Planters' Notes
印刷版ISSN：0096-8714
出版年度：2015
卷号：58
期号：2
页码：72
出版社：US Department of Agriculture, Forest Service
摘要：Treatments of 50 ppm, 50 ppm (two applications), 100 ppm,and 200 ppm and also 5 and 10 ppm drench applications ofthe plant growth regulator (PGR) Bonzi® (paclobutrazol)significantly reduced height growth while maintaining stemdiameter growth in red alder (Alnus rubra Bong.) containerseedlings, resulting in a sturdy, compact seedling at transplant.Although the use of PGR facilitated the midseasontransplanting process, end-of-season height, stem diameter,and packout totals of field-transplanted seedlings were notsignificantly different than the control group. In a second trial,Bonzi and Sumagic® (uniconazole-P) PGRs were applied tocoastal Douglas-fir (Pseudotsuga menziesii [Mirb.] Franco)container seedlings to help stimulate shutdown. Treatmentsof 10, 20, and 40 ppm Sumagic® significantly reduced heightgrowth compared with control seedlings, but stem diametergrowth was significantly reduced as well. Bonzi® treatmentsof 50, 100, and 200 ppm did not significantly reduce heightgrowth, while stem diameter growth was slightly lower thancontrols. Only the 10 ppm Sumagic® treatment producedsturdier (lower height-to-stem diameter ratio) seedlingscompared with control seedlings. Used in conjunction withother cultural techniques, PGRs may offer the grower anothertool to manipulate seedling growth. At this time, PGRs showmore promise in red alder than Douglas-fir seedling production.This paper was presented at a joint meeting of the WesternForest and Conservation Nursery Association, the IntermountainContainer Seedling Growers Association, and the IntertribalNursery Council (Boise, ID, September 9–11, 2014).