dc.contributor.advisor | Smeda, R. J. (Reid John), 1960- | eng |
dc.contributor.author | Fresenburg, Brad S., 1954- | eng |
dc.date.issued | 2010 | eng |
dc.date.submitted | 2010 Fall | eng |
dc.description | Title from PDF of title page (University of Missouri--Columbia, viewed on March 7, 2011). | eng |
dc.description | The entire thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file; a non-technical public abstract appears in the public.pdf file. | eng |
dc.description | Dissertation advisor: Dr. Reid J. Smeda. | eng |
dc.description | Vita. | eng |
dc.description | Ph. D. University of Missouri--Columbia 2010. | eng |
dc.description.abstract | Allelopathy is a complex phenomenon among plants that involves the production of defensive chemicals that influence the growth and survival of adjacent plants. Plants like perennial ryegrass become suspect when bermudagrass (Cynodon spp.) cover is reduced by 88% when seeded into perennial ryegrass. Over-seeding bermudagrass with ryegrass (Lolium spp.) is a common cultural practice on golf courses and athletic fields in late summer as bermudagrass becomes dormant. In spring, removal of ryegrass is essential for bermudagrass recovery or decline of bermudagrass is inevitable. However, underlying reasons for this decline is unknown. Objectives of this research were to assess allelopathic effects of ryegrasses on bermudagrass and determine best management practices for spring removal of intermediate (Lolium multiforum Lam. x Lolium perenne L.) and perennial ryegrass by cultural practices and herbicide applications. Cultural practices (mowing and fertility) reduced intermediate ryegrass stand by 10% when mowing height was decreased and urea fertilizer was added. Mowing height and fertilizer applications, alone, are not sufficient in the removal of improved perennial ryegrasses. Herbicide treatments (chlorsulfuron, rimsulfuron, metsulfuron, trifloxysulfuron, foramsulfuron, and sulfosulfuron) resulted in rapid reductions ([greater than] 95%) of all ryegrass cultivars. All herbicide treatments enhanced bermudagrass recovery. In vitro agar-assays with ryegrass water extracts reduced bermudagrass seed germination by 62%. Fractionation of soluble allelochemicals by HPLC confirmed inhibitory activity on bermudagrass seed germination from 37 to 0%. While cultural practices alone may not be enough to remove perennial ryegrass, chemical removal of ryegrasses may be too rapid for a smooth spring transition. Identifying allelochemicals in ryegrass could lead to the development of natural bermudagrass herbicides. | eng |
dc.description.bibref | Includes bibliographical references. | eng |
dc.format.extent | 104 pages | eng |
dc.identifier.oclc | 706711230 | eng |
dc.identifier.uri | https://hdl.handle.net/10355/10261 | |
dc.identifier.uri | https://doi.org/10.32469/10355/10261 | eng |
dc.language | English | eng |
dc.publisher | University of Missouri--Columbia | eng |
dc.relation.ispartofcommunity | University of Missouri--Columbia. Graduate School. Theses and Dissertations | eng |
dc.rights | OpenAccess. | eng |
dc.rights.license | This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License. | |
dc.subject.lcsh | Allelopathic agents | eng |
dc.subject.lcsh | Ryegrasses | eng |
dc.subject.lcsh | Bermuda grass | eng |
dc.title | Allelopathic effects and removal of overseeded ryegrass on bermudagrass | eng |
dc.type | Thesis | eng |
thesis.degree.discipline | Plant sciences (MU) | eng |
thesis.degree.grantor | University of Missouri--Columbia | eng |
thesis.degree.level | Doctoral | eng |
thesis.degree.name | Ph. D. | eng |