The Physiology of Landscape Establishment of Kalmia latifolia

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dc.contributor.advisor Stuart L. Warren, Committee Co-Chair en_US
dc.contributor.advisor Frank A. Blazich, Committee Co-Chair en_US
dc.contributor.advisor Thomas G. Ranney, Committee Member en_US
dc.contributor.advisor Udo Blum, Committee Member en_US Wright, Amy Noelle en_US 2010-04-02T18:27:10Z 2010-04-02T18:27:10Z 2002-05-10 en_US
dc.identifier.other etd-05102002-135147 en_US
dc.description.abstract Although native to the eastern United States, with a broad geographic range, mountain laurel (Kalmia latifolia L.) frequently does not survive transplanting from containers into the landscape and is generally regarded as a difficult-to-transplant species. In an effort to understand poor transplant success and to improve landscape establishment of the species, four experiments were conducted to describe some of the critical factors associated with transplanting mountain laurel. In some cases, research included comparison of mountain laurel to that of an easy-to-transplant species, Japanese holly (Ilex crenata Thunb.). In the first study, root growth of mountain laurel was compared to that of Japanese holly over the course of 1 year. Root length and root surface area of mountain laurel increased in the fall but decreased in the spring, while root length and root surface area of Japanese holly increased linearly throughout the year. Root : shoot ratio increased linearly for Japanese holly but did not increase during the spring for mountain laurel. The second study compared the effects of root-zone temperature on root growth of mountain laurel and Japanese holly. When mountain laurel and Japanese holly were grown hydroponically in the fall and the spring at 9 hour days/15 hour nights of 26/22C with root-zone temperatures of 16, 24, or 32C, percent increase in root length and root surface area were highest at 16C for mountain laurel and 24C for Japanese holly. At each root-zone temperature, percent survival was higher for Japanese holly than mountain laurel. More root growth occurred in the fall than in the spring for both species. Root : shoot ratio of mountain laurel was higher in the fall than in the spring, whereas root : shoot ratio of Japanese holly was similar for both seasons. A third investigation compared drought tolerance of mountain laurel to that of Japanese holly. In response to several drought treatments, shoot dry weight decreased more rapidly with increasing drought stress for mountain laurel than Japanese holly. Pre-dawn plant water potential decreased faster for mountain laurel than Japanese holly. Although both species appeared to osmotically adjust, mountain laurel was less drought tolerant than Japanese holly. Osmotic adjustment occurred only in more severely stressed plants. The fourth experiment investigated the influence of root : shoot ratio on survival and subsequent growth of transplanted, container-grown mountain laurel. Landscape exposure and initial root : shoot ratio of transplanted mountain laurel influenced plant survival and growth over three growing seasons. Shoot growth (stems and leaves) and visual quality were highest for plants with largest initial root : shoot ratio. In general, plant growth, survival, and visual ratings were higher on north and east exposures than on south and west exposures. en_US
dc.rights I hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to NC State University or its agents the non-exclusive license to archive and make accessible, under the conditions specified below, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report. en_US
dc.subject mountain laurel en_US
dc.subject transplanting en_US
dc.subject root growth en_US
dc.subject woody ornamental en_US
dc.title The Physiology of Landscape Establishment of Kalmia latifolia en_US PhD en_US dissertation en_US Horticultural Science en_US

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