Full TGIF Record # 97227
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DOI:10.21273/HORTSCI.39.5.1130
Web URL(s):https://journals.ashs.org/hortsci/view/journals/hortsci/39/5/article-p1130.xml?rskey=qzaWiM
    Last checked: 11/19/2019
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Publication Type:
i
Refereed
Author(s):Bell, G. E.; Howell, B. M.; Johnson, G. V.; Raun, W. R.; Solie, J. B.; Stone, M. L.
Author Affiliation:Bell: Department of Horticulture and Landscape Architecture, Oklahoma State University, Stillwater, Oklahoma; Howell: Oklahoma State University, Tulsa, Oklahoma; Johnson and Raun: Department of Plant and Soil Science, Oklahoma State University, Stillwater, Oklahoma; Solie and Stone: Department of Biosystems and Agricultural Engineering, Oklahoma State University, Stillwater, Oklahoma
Title:Optical sensing of turfgrass chlorophyll content and tissue nitrogen
Section:Turf management
Other records with the "Turf management" Section
Source:HortScience. Vol. 39, No. 5, August 2004, p. 1130-1132.
# of Pages:3
Publishing Information:Alexandria, VA: American Society for Horticultural Science
Keywords:TIC Keywords: Chlorophyll; Nitrogen; Nutrition; Remote sensing; Cynodon dactylon; Cynodon transvaalensis; Agrostis stolonifera; Nitrogen fertilizers; Clippings; Color
Cultivar Names:U3; Midfield; SR 1020
Abstract/Contents:"Differences in soil microenvironment affect the availability of N in small areas of large turfgrass stands. Optical sensing may provide a method for assessing plant N needs among these small areas and could help improve turfgrass uniformity. The purpose of this study was to determine if optical sensing was useful for measuring turfgrass responses stimulated by N fertilization. Areas of `U3' bermudagrass [Cynodon dactylon 9L.) Pers.], `Midfield' bermudagrass [C. dactylon 9L.) Pers. × C. transvaalensis Burtt-Davy], and `SR1020' creeping bentgrass (Agrostis palustris Huds.) were divided into randomized complete blocks and fertilized with different N rates. A spectometer was used to measure energy reflected from the turfgrass within the experimental units at 350 to1100 [to 1100] nm wavelengths. This spectral information was used to calculate normalized difference vegetation index (NDVI) and green normalized difference vegetation index (GNDVI). These specral indices were regressed with tissue N and chlorophyll content determined from turfgrass clippings collected immediately following optical sensing. The coefficients of determination for NDVI and GNDVI regressed with tissue N averaged r2 = 0.76 and r2 = 0.81, respectively. The coefficients of determination for NDVI and GNDVI regressed with chlorophyll averaged r2 = 0.70 and r2 = 0.75, respectively. Optical sensing was equally effective for estimating turfrass responses to N fertilization as more commonly used evaluations such as shoot growth rate (SGR regressed with tissue N; r2 = 0.81) and visual color evaluation (color regressed with chlorophyll; r2 = 0.64)."
Language:English
References:19
Note:Tables
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Bell, G. E., B. M. Howell, G. V. Johnson, W. R. Raun, J. B. Solie, and M. L. Stone. 2004. Optical sensing of turfgrass chlorophyll content and tissue nitrogen. HortScience. 39(5):p. 1130-1132.
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DOI: 10.21273/HORTSCI.39.5.1130
Web URL(s):
https://journals.ashs.org/hortsci/view/journals/hortsci/39/5/article-p1130.xml?rskey=qzaWiM
    Last checked: 11/19/2019
    Requires: PDF Reader
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MSU catalog number: SB 1 .H64
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