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| Web URL(s): | http://www.newss.org/proceedings/Proceedings_NEPPSC16_Vol1.pdf#page=176
Last checked: 03/15/2018
Requires: PDF Reader
Notes: Item is within a single large file |
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| Publication Type:
| Proceedings |
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| Content Type: | Abstract or Summary Only |
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| Author(s): | McCall, D. S.;
Sullivan, D. |
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| Author Affiliation: | Virginia Tech, Blacksburg, VA |
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| Title: | Comparison of vegetation indices for chlorophyll content and drought stress |
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| Section: | Turf and ornamentals
Other records with the "Turf and ornamentals" Section
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| Meeting Info.: | Philadelphia, Pennsylvania: January 3-7, 2016 |
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| Source: | Proceedings of the First Annual Meeting of the Northeastern Plant, Pest, and Soils Conference. 2016, p. 150-151. |
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| Publishing Information: | s.l.: Northeastern Weed Science Society; the Eastern Branch of the Entomological Society of America; the Northeastern Division of the American Phytopathological Society; the Northeast Branch of the American Society of Agronomy; the Crop Science Society of America; the Soil Science Society of America; and the American Society of Horticultural Science-Northeast Region |
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| # of Pages: | 2 |
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| Keywords: | TIC Keywords: Aesthetic values; Agrostis stolonifera; Chlorophyll content; Comparisons; Drought stress; Soil water content; Stress response; Turfgrass quality; Visual evaluation
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| Abstract/Contents: | "Yield is not an important characteristic for maintained turfgrasses, therefore stands are measured by aesthetic appearance and ability to withstand a variety of stresses. Historically, researchers have quantified the acceptance of a turfgrass by its visual quality. The National Turfgrass Evaluation Program recommends the use of a 1-9 subjective rating scale by a trained evaluator, where 9 equals highest turf quality and a minimally accepted threshold is defined by the rater. Due to rater inconsistencies and bias, vegetation indices (VI) that utilize light reflectance from plants at specific wavelengths have been adopted as an objective alternative measurement because of strong correlation to visual ratings. The normalized difference vegetation index (NDVI) is commonly used in agricultural research and related fields because of a strong relationship to many plant health characteristics. Relationships have been established between NDVI of turfgrass canopies and important factors that impact stand health, including soil moisture content and leaf chlorophyll content. Numerous VI have been established because of demonstrated relationships to specific variables of interest. It is not known whether indices are useful for distinguishing stress to turfgrasses by limited moisture or chlorophyll availability. Therefore the objective of this ongoing study was to compare the relationships of twelve established VI to tissue chlorophyll content and soil water content of creeping bentgrass. Eight week old 'L-93' creeping bentgrass Conetainers were maintained under greenhouse conditions with a soil profile built to USGA specifications. A 2X2 factorial design was arranged in randomized complete blocks with five replications. The experiment will be repeated once. Factors included A) irrigated (1 cm 48hr-1) versus non-irrigated and B) fertilized (24.4 kg N ha-1, 46-0-0) versus non-fertilized. Data collected included spectral reflectance (400-1100 nm), soil volumetric water content, leaf chlorophyll content, and visual assessment of turf quality and turf color. Data were subjected to analysis of variance and means were separated (LSD, P = 0.05). Relationship between variables was determined using Pearsons correlation coefficient. All VI were moderately to strongly related to visual turf quality (49-85 percent). NDVI and three other indices were useful for detecting treatment effects of both irrigation and fertilization, but were unable to differentiate. Four indices (WBI, GRVI, RGVI, NDRE) detected changes in soil moisture content but not fertility, whereas fertility effects could be distinguished with four different VI (CHLOR1, GNDVI, 151 SUM G, NDVI 705). The strongest relationship to soil moisture was with the water band index (WBI, 80 percent). All distinguishable VI for fertility had the strongest correlation to turf color (78-85 percent) and chlorophyll content (55-63 percent). This research demonstrates that spectral data may be used to differentiate soil water availability from plant nutritional needs." |
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| Language: | English |
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| References: | 0 |
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| Note: | This item is an abstract only! |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
McCall, D. S., and D. Sullivan. 2016. Comparison of vegetation indices for chlorophyll content and drought stress. p. 150-151. In Proceedings of the First Annual Meeting of the Northeastern Plant, Pest, and Soils Conference. Philadelphia, Pennsylvania: January 3-7, 2016. s.l.: Northeastern Weed Science Society; the Eastern Branch of the Entomological Society of America; the Northeastern Division of the American Phytopathological Society; the Northeast Branch of the American Society of Agronomy; the Crop Science Society of America; the Soil Science Society of America; and the American Society of Horticultural Science-Northeast Region. |
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| Web URL(s):
http://www.newss.org/proceedings/Proceedings_NEPPSC16_Vol1.pdf#page=176
Last checked: 03/15/2018
Requires: PDF Reader
Notes: Item is within a single large file |
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