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| DOI: | 10.21273/HORTSCI.33.3.443 |
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| Web URL(s): | https://journals.ashs.org/hortsci/view/journals/hortsci/33/3/article-p443.xml
Last checked: 11/14/2019
Requires: PDF Reader
Notes: Item is within a single large file; Abstract only |
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| Publication Type:
| Refereed |
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| Author(s): | Wiest, Steven C. |
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| Author Affiliation: | Dept. HFRR. Kansas State Univ., Manhattan, KS 66506 |
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| Title: | Quantitative seasonal changes in gross turfgrass morphometry |
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| Section: | Crop physiology: Chemical/developmental/metabolic- Cross-commodity
Other records with the "Crop physiology: Chemical/developmental/metabolic- Cross-commodity" Section
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| Source: | HortScience. Vol. 33, No. 3, June 1998, p. 456 (073). |
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| Publishing Information: | Alexandria, VA: American Society for Horticultural Science |
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| # of Pages: | 1 |
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| Keywords: | TIC Keywords: Color; Measurement; Seasonal variation; Reflectance; Leaf area; Cynodon dactylon; Bouteloua dactyloides; Zoysia japonica; Festuca arundinacea
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| Abstract/Contents: | "Photographs of turfgrass canopies were taken throughout Spring, Summer and Fall 1997 at a height of 1.3 m using a 28-mm lens and film sensitive to either visible or infrared light. The specieis evaluated were warm-season Bermudagrass, buffalograss, zoysiagrass, and cool-season tall fescue. Color spectra of digitized photographs were obtained by first separating the hue, saturation, and intensity components of the color photo into seperate 8-bit (256 gray levels) files. Calculations were then made on the basis of those color components. The infrared photos were scanned as 8-bit files without conversion. Greenup was indicated by a decrease in the frequency of hues between 0 and 50^DG (reds, browns, and yellows) and an increase in the frequency of hues between 50 and 100^DG (green and yellow-green). It is well-known that canopy reflectance in the green wavelengths is a primary function of chlorophyll density, whereas reflectance of near-infrared radiation is indicative more of cell structure. More near-infrared radiation is refelcted from leaf surfaces than is green radiation, and less infrared is absorbed by internal leaf structures than is visible radiation. Thus, it is possible to approximate canopy leaf area ratios by using both visible and near-infrared photographic measurements. leaf-area ratios, and other morphometric parameters will be presented as a function of time of the year and species. The results demonstrate the utility of using this relatively inexpensive procedure to obtain quantitative measurements as a substitute for, or in conjunction with, subjective visual ratings of turfgrass plots." |
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| Language: | English |
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| References: | 0 |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Wiest, S. C. 1998. Quantitative seasonal changes in gross turfgrass morphometry. HortScience. 33(3):p. 456 (073). |
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| DOI: 10.21273/HORTSCI.33.3.443 |
| Web URL(s):
https://journals.ashs.org/hortsci/view/journals/hortsci/33/3/article-p443.xml
Last checked: 11/14/2019
Requires: PDF Reader
Notes: Item is within a single large file; Abstract only |
| 
MSU catalog number: SB 1 .H64 |
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