scholarly journals Evaluation of Experimental Bermudagrasses under Simulated Athletic Field Traffic with Perennial Ryegrass Overseeding

2012 ◽  
Vol 22 (1) ◽  
pp. 94-98 ◽  
Author(s):  
William D. Haselbauer ◽  
Adam W. Thoms ◽  
John C. Sorochan ◽  
James T. Brosnan ◽  
Brian M. Schwartz ◽  
...  
Keyword(s):  
Image Analysis ◽  
Lolium Perenne ◽  
Perennial Ryegrass ◽  
Digital Image ◽  
Digital Image Analysis ◽  
Cynodon Dactylon ◽  
Athletic Fields ◽  
Athletic Field ◽  
Traffic Tolerance

Hybrid bermudagrass (Cynodon dactylon × C. transvaalensis) varieties such as Tifway and TifSport commonly are used on athletic fields. Several experimental hybrid bermudagrasses have been recently developed. However, data describing the performance of these bermudagrasses under simulated athletic field traffic are limited. A 2-year study was conducted evaluating the traffic tolerance of five experimental (2004-76, 2004-83, 2004-78, Tift 11, and 2004-77) and three commercially available (‘Tifway’, ‘TifSport’, and ‘TifGrand’) hybrid bermudagrasses. These bermudagrasses were subjected to two mowing (mowing at 0.87 inches or mowing at 0.87 inches + grooming to a 0.10-inch depth) and overseeding [no overseeding or overseeding with perennial ryegrass (Lolium perenne) at 12 lb/1000 ft2 of pure live seed] regimes. Simulated traffic tolerance using the Cady traffic simulator (CTS) was quantified using measurements of turfgrass cover with digital image analysis (DIA). Experimental bermudagrasses Tift 11 and 2004-76 and the commercially available variety TifGrand yielded turfgrass cover values greater than or equal to ‘Tifway’, a commonly used variety, on all rating dates each year. Experimental bermudagrass 2004-83 yielded the lowest turfgrass cover values on each date. Findings suggest that ‘TifGrand’, 2004-76, and Tift 11 may be suitable for use on athletic fields.

scholarly journals Effects of Various Plant Growth Regulators on the Traffic Tolerance of ‘Riviera’ Bermudagrass (Cynodon dactylon L.)

HortScience ◽  
2010 ◽  
Vol 45 (6) ◽  
pp. 966-970 ◽  
Author(s):  
James T. Brosnan ◽  
Adam W. Thoms ◽  
Gregory K. Breeden ◽  
John C. Sorochan
Keyword(s):  
Image Analysis ◽  
Plant Growth ◽  
Plant Growth Regulator ◽  
Digital Image Analysis ◽  
Cynodon Dactylon ◽  
Acid Ethyl Ester ◽  
Color Quality ◽  
Athletic Field ◽  
Traffic Tolerance ◽  
Cyclohexane Carboxylic Acid

Data describing effects of plant growth regulator (PGR) applications on bermudagrass (Cynodon spp.) traffic tolerance are limited. A 2-year study was conducted evaluating effects of several PGRs on ‘Riviera’ bermudagrass (Cynodon dactylon L.) traffic tolerance. Treatments included 1) ethephon at 3.8 kg·ha−1; 2) trinexapac-ethyl (TE) at 0.096 kg·ha−1; 3) paclobutrazol at 0.28 kg·ha−1; 4) flurprimidol at 0.0014 kg·ha−1; 5) flurprimidol + TE at 0.0014 kg·ha−1 + 0.096 kg·ha−1, respectively; 6) ethephon + TE at 3.8 kg·ha−1 + 0.096 kg·ha−1, respectively; and 7) untreated control. All treatments were applied three times on a 21-d interval before trafficking. Plots were subjected to three simulated football games per week with the Cady Traffic Simulator. Traffic began 2 weeks after the last sequential application of each PGR. Turfgrass color, quality, and cover were quantified weekly using digital image analysis. Turfgrass cover measurements were used to assess traffic tolerance. Improvements in turfgrass color, quality, and cover were observed with applications of TE, ethephon + TE, and flurprimidol + TE. Turfgrass color, quality, and cover were enhanced for ethephon + TE and flurprimidol +TE compared with applications of ethephon and flurprimidol alone. Considering that no differences in turfgrass color, quality, or cover were detected among TE, ethephon + TE, and flurprimidol + TE at any time in the study, the responses observed suggest that TE may have a greater impact than other PGRs on ‘Riviera’ bermudagrass athletic field turf when applied before traffic stress. Chemical names used: rthephon (2-chloroethyl)phosphonic acid; glurprimidol {α-(1-methylethyl)-α-[4-(trifluoro-methoxy) phenyl] 5-pyrimidine-methanol}; paclobutrazol, (+/−)-(R*,R*)-β-[(4-chlorophenyl) methyl]-α-(1–1-dimethyl)-1H-1,2,4,-triazole-1-ethanol; trinexapac-ethyl [4-(cyclopropyl-[α]-hydroxymethylene)-3,5-dioxo-cyclohexane carboxylic acid ethyl ester].

scholarly journals Use of Canopeo for Estimating Green Coverage of Bermudagrass during Postdormancy Regrowth

2021 ◽  
pp. 1-3
Author(s):  
Manoj Chhetri ◽  
Charles Fontanier
Keyword(s):  
Image Analysis ◽  
Perennial Ryegrass ◽  
Digital Image Analysis ◽  
Cynodon Dactylon ◽  
Block Design ◽  
Digital Camera ◽  
Smartphone Application ◽  
Winter Dormancy ◽  
Randomized Complete Block Design ◽  
Imagej Software

Objective methods of estimating green coverage using digital image analysis have been used increasingly by turfgrass scientists. The objective of our research was to evaluate the effectiveness of Canopeo, a relatively new smartphone application, for estimating green coverage of bermudagrass (Cynodon dactylon) emerging from winter dormancy, with or without colorants. A field study was conducted on a research ‘U3’ bermudagrass fairway in Stillwater, OK, during Spring 2019 and 2020. The experiment was conducted as a randomized complete block design with three colorant treatments: Endurant Fairway (FW), Endurant Perennial Ryegrass (PR), and an untreated control. Green coverage of the turfgrass canopy was determined weekly from mid-March to early May using a digital camera and ImageJ software, and a smartphone and the Canopeo application. Green coverage estimates from Canopeo correlated strongly (r = 0.91) with those from ImageJ when no colorants were applied. Correlation between Canopeo and ImageJ was diminished under plots treated with colorants. Canopeo is an effective tool for estimating green coverage of living turfgrasses, but additional calibration may be required for acceptable performance when evaluating greenness of colorant-treated turfgrasses.

Digital Image Analysis of the Larynx

2000 ◽  
Vol 10 (2) ◽  
pp. 7-9
Author(s):  
Yaser Natour ◽  
Christine Sapienza ◽  
Mark Schmalz ◽  
Savita Collins
Keyword(s):  
Image Analysis ◽  
Digital Image ◽  
Digital Image Analysis

scholarly journals Digital Image Analysis of BAP-1 Accurately Predicts Uveal Melanoma Metastasis

2019 ◽  
Vol 8 (3) ◽  
pp. 11 ◽  
Author(s):  
Gustav Stålhammar ◽  
Thonnie Rose O. See ◽  
Stephen Phillips ◽  
Stefan Seregard ◽  
Hans E. Grossniklaus
Keyword(s):  
Image Analysis ◽  
Uveal Melanoma ◽  
Digital Image ◽  
Digital Image Analysis ◽  
Melanoma Metastasis

Quantitative evaluation of elderly skin based on digital image analysis

2008 ◽  
Vol 14 (2) ◽  
pp. 192-200 ◽  
Author(s):  
Hiromasa Tanaka ◽  
Gojiro Nakagami ◽  
Hiromi Sanada ◽  
Yunita Sari ◽  
Hiroshi Kobayashi ◽  
...  
Keyword(s):  
Image Analysis ◽  
Quantitative Evaluation ◽  
Digital Image ◽  
Digital Image Analysis

scholarly journals In vitro validation of Digital Image Analysis Sequence (DIAS) for the assessment of the marginal fit of cement-retained implant-supported experimental crowns

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Aristeidis A. Villias ◽  
Stefanos G. Kourtis ◽  
Hercules C. Karkazis ◽  
Gregory L. Polyzois
Keyword(s):  
Image Analysis ◽  
Digital Image ◽  
Confidence Level ◽  
Digital Image Analysis ◽  
Statistical Tests ◽  
Interobserver Reliability ◽  
Intraclass Correlation ◽  
Marginal Fit ◽  
Smallest Detectable Change ◽  
The Mean

Abstract Background The replica technique with its modifications (negative replica) has been used for the assessment of marginal fit (MF). However, identification of the boundaries between prosthesis, cement, and abutment is challenging. The recently developed Digital Image Analysis Sequence (DIAS) addresses this limitation. Although DIAS is applicable, its reliability has not yet been proven. The purpose of this study was to verify the DIAS as an acceptable method for the quantitative assessment of MF at cemented crowns, by conducting statistical tests of agreement between different examiners. Methods One hundred fifty-one implant-supported experimental crowns were cemented. Equal negative replicas were produced from the assemblies. Each replica was sectioned in six parts, which were photographed under an optical microscope. From the 906 standardized digital photomicrographs (0.65 μm/pixel), 130 were randomly selected for analysis. DIAS included tracing the profile of the crown and the abutment and marking the margin definition points before cementation. Next, the traced and marked outlines were superimposed on each digital image, highlighting the components’ boundaries and enabling MF measurements. One researcher ran the analysis twice and three others once, independently. Five groups of 130 measurements were formed. Intra- and interobserver reliability was evaluated with intraclass correlation coefficient (ICC). Agreement was estimated with the standard error of measurement (SEM), the smallest detectable change at the 95% confidence level (SDC95%), and the Bland and Altman method of limits of agreement (LoA). Results Measured MF ranged between 22.83 and 286.58 pixels. Both the intra- and interobserver reliability were excellent, ICC = 1 at 95% confidence level. The intra- and interobserver SEM and SDC95% were less than 1 and 3 pixels, respectively. The Bland–Altman analysis presented graphically high level of agreement between the mean measurement of the first observer and each of the three other observers’ measurements. Differences between observers were normally distributed. In all three cases, the mean difference was less than 1 pixel and within ± 3 pixels LoA laid at least 95% of differences. T tests of the differences did not reveal any fixed bias (P > .05, not significant). Conclusion The DIAS is an objective and reliable method able to detect and quantify MF at ranges observed in clinical practice.

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