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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
11

Identification and management of moss and phytopathogenic algae common on creeping bentgrass putting greens

Borst, Steven Michael, January 2008 (has links) (PDF)
Thesis (M.S.)--University of Tennessee, Knoxville, 2008. / Title from title page screen (viewed on Sept. 23, 2009). Thesis advisor: J. Scott McElroy. Vita. Includes bibliographical references.
12

Mowing and light-weight rolling of creeping bentgrass (Agrostis stolonifera L.) putting greens during summer heat stress periods in the transition zone

Strunk, William Daniel, January 2006 (has links) (PDF)
Thesis (M.S.) -- University of Tennessee, Knoxville, 2006. / Title from title page screen (viewed on May 31, 2006). Thesis advisor: John C. Sorochan. Vita. Includes bibliographical references.
13

The Effect of Brushing on Creeping Bentgrass Putting Green Quality

Gu, Chenchen 23 September 2016 (has links)
No description available.
14

THE EFFECT OF ALTERED ASSIMILATE ALLOCATION AND PARTITIONING DUE TO PCGA2-OXIDASE OVEREXPRESSION ON THE GROWTH AND PERFORMANCE OF CREEPING BENTGRASS (AGROSTIS STOLONIFERA L.) IN FULL SUN AND REDUCED LIGHT

Studzinska, Aneta Karolina 21 March 2011 (has links)
No description available.
15

Water use and summer stress tolerance mechanisms for creeping bentgrass and Kentucky bluegrass

McCann, Stephen E. January 2008 (has links)
Thesis (Ph. D.)--Rutgers University, 2008. / "Graduate Program in Plant Biology." Includes bibliographical references.
16

Inter- and Intra-Specific Variation in Wear Mechanisms in Agrostis: I. Wear Tolerance and Recovery Ii. Anatomical, Morphological and Physiological Characteristics

Dowgiewicz, Jason M 01 January 2009 (has links) (PDF)
Creeping bentgrass (Agrostis stolonifera L.) and velvet bentgrass (Agrostis canina L.) are the principal grass species for golf course putting greens in northern latitudes. Wear injury is a major physical stress that limits the function and quality of turfgrass. Wear evaluations in Agrostis species are limited and no studies have been conducted to evaluate recovery from wear and associated wear mechanisms. To that end, Agrostis species and genotypes were evaluated for wear tolerance and recovery on a golf green built according to USGA specifications. Equal numbers of creeping bentgrass and velvet bentgrass genotypes were tested. Wear was applied using a grooming brush over a 3-year period and plots were visually rated for wear and recovery. As much as 90% of the total variation in Agrostis wear tolerance was due to interspecific variation. Velvet entries provided significantly better wear tolerance than creeping bentgrass. Velvet bentgrass genotypes provided acceptable wear tolerance and full recovery in most years with the exception of SR-7200. None of the creeping bentgrass entries evaluated exhibited acceptable wear tolerance or achieved full recovery. Fourteen Agrostis genotypes, which included equal numbers of creeping and velvet species were selected for further evaluation of anatomical, morphological and physiological characterstics associated with wear tolerance. Eleven characteristics were measured comparing greenhouse grown spaced-plants established from field plots and seed. Characteristics included tiller density, shoot dry weight, shoot water content, relative water content (RWC), leaf width, leaf strength, leaf angle, crown type and leaf cell wall constituents. Siginificant interspecific difference in charactersitics were found. Little difference at the intraspecific level was obserevd especially within creeping bentgrass. Wear tolerant velvet genotypes were associated with a more vertical tiller and leaf angle, greater cell wall content and greater shoot density. Lignocellulose content accounted for as much as 62.8 to 72.3% of the variation in Agrostis wear tolerance while tiller density accounted for as much as 65.9 to 75.8%. Wear tolerance in Agrostis can be improved by giving priority to breeding for greater density and cell wall content with secondary emphasis to breeding for a more upright growth habit (tiller and leaf).
17

The effect of seaweed concentrate on turfgrass growth, nematode tolerance and protein synthesis under moisture stress conditions /

Sun, Hongwei, January 1994 (has links)
Thesis (Ph. D.)--Virginia Polytechnic Institute and State University, 1994. / Vita. Abstract. Includes bibliographical references. Also available via the Internet.
18

The Effects of Methiozolin Rates and Nitrogen Fertility Strategies for Annual Bluegrass Control and Creeping Bentgrass Safety on Golf Greens

Fang, Chen January 2015 (has links)
No description available.
19

Expanding the Application of Spectral Reflectance Measurement in Turfgrass Systems

McCall, David S. 05 July 2016 (has links)
Light reflectance from plants can be used as a non-invasive predictor of health and yield for many cropping systems, and has been investigated to a lesser extent with managed turfgrass systems. The frequent agronomic inputs associated with maintaining golf course grasses allow for exceptional stand quality under harsh growing conditions, but often expend resources inefficiently, leading to either stand loss or unnecessary inputs in localized areas. Turfgrass researchers have adopted some basic principles of light reflectance formerly developed for cropping systems, but field radiometric-derived narrow-band algorithms for turfgrass-specific protocols are lacking. Research was conducted to expand the feasibility of using radiometry to detect various turfgrass stressors and improve speed and geographic specificity of turfgrass management. Methods were developed to detect applied turfgrass stress from herbicide five days before visible symptoms developed under normal field growing conditions. Soil volumetric water content was successfully estimated using a water band index of creeping bentgrass canopy reflectance. The spectral reflectance of turfgrass treated with conventional synthetic pigments was characterized and found to erroneously influence plant health interpretation of common vegetation indices because of near infrared interference by such pigments. Finally, reflectance data were used to estimate root zone temperatures and root depth of creeping bentgrass systems using a gradient of wind velocities created with turf fans. Collectively, these studies provide a fundamental understanding of several turfgrass-specific reflectance algorithms and support unique opportunities to detect stresses and more efficiently allocate resources to golf course turf. / Ph. D.
20

Evaluating methiozolin programs for golf putting greens and investigating potential modes of action

Venner, Katelyn 06 October 2015 (has links)
Annual bluegrass is a winter annual grass that is problematic on golf putting greens due to its light green color, prolific seedhead production and intolerance to stress. On creeping bentgrass putting greens, herbicides for annual bluegrass control are limited. A new herbicide, methiozolin, developed by Moghu Research Center, LLC, in Daejeon, South Korea, safely and selectively controls annual bluegrass in creeping bentgrass and several other turfgrass species. Methiozolin typically controls annual bluegrass over several weeks, allowing desirable turfgrass time to grow into areas previously infested by annual bluegrass with little surface disruption. The mode of action of methiozolin is unknown, but has been proposed to act as either a cell wall biosynthesis inhibitor (CBI) or an inhibitor of tyrosine aminotransferase (TAT). Field studies were conducted at Virginia Tech to investigate strategies promoting surface recovery on putting greens following atypically rapid annual bluegrass loss resulting from methiozolin application, intensive core-cultivation as well as potential interactions with plant growth regulators (PGR's), like ethephon. In the rapid annual bluegrass removal study, all treatments receiving additional fertility via synthetic fertilizer with or without trinexapac-ethyl or biostimulant recovered 1 to 3 weeks more quickly than treatments that did not include additional fertility. Addition of the PGR trinexapac-ethyl inconsistently regulated speed of canopy recovery, both increasing and decreasing recovery speed. Under normal maintenance conditions, methiozolin does not negatively influence putting green recovery, however, if the putting green is exposed to droughty conditions, methiozolin can reduce recovery time by several weeks. Core-cultivation should be avoided in conjunction with methiozolin and ethephon applications because when this procedure was conducted on the same day as herbicide application it significantly damaged creeping bentgrass, reducing cover to 19% at 2000 g ai ha⁻¹, compared to the non-treated at 62%. Regarding the question of methiozoling mode of action, laboratory studies supported the claim that addition of exogenous 4-hydroxyphenylpyruvate (4-HPP) alleviates symptoms of methiozolin exposure in lesser duckweed, a model monocot species, but feeding various turfgrass species and annual bluegrass exogenous 4-HPP did not alleviate symptoms. Creeping bentgrass secondary root length and density was not affected by methiozolin, although annual bluegrass, Kentucky bluegrass and perennial ryegrass secondary root lengths were reduced. Based on these data, it does not appear that TAT inhibition is a primary mode of action of methiozolin in turfgrass. Studies were conducted to determine if methiozolin inhibited cell wall biosynthesis in desirable turfgrass species and annual bluegrass. All species exhibited decreased enrichment of ¹³C in cell-wall sugars form ¹³C-glucose in response to methiozolin and a known cell wall biosynthesis inhibitor, indaziflam. Indaziflam and methiozolin at 0.01 µM inhibited ¹³C enrichment of all sugars less than methiozolin at 1.0 µM, for xylose, arabinose and glucose, but not galactose. Addition of 4-HPP increased incorporation of ¹³C into xylose, but had no other influence on ¹³C incorporation into other cell wall sugars. Lack of species specific response indicates that cell wall biosynthesis inhibition is probably not the source of interspecific species responses observed in the field. / Ph. D.

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