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| Web URL(s): | https://elibrary.asabe.org/azdez.asp?AID=24055&T=2
Last checked: 03/07/2016
Requires: PDF Reader |
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| Publication Type:
| Refereed |
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| Author(s): | Baghzouz, M.;
Devitt, D. A.;
Morris, R. L |
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| Author Affiliation: | Baghzouz: Graduate Research Assistant; Devitt: Professor, School of Life Sciences, University of Nevada-Las Vegas, Las Vegas, Nevada; Morris: Associate Professor, University of Nevada-Reno, Las Vegas, Nevada |
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| Title: | Assessing canopy spectral reflectance of hybrid bermudagrass under various combinations of nitrogen and water treatments |
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| Section: | Soil & water
Other records with the "Soil & water" Section
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| Source: | Applied Engineering in Agriculture. Vol. 23, No. 6, 2007, p. 763-774. |
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| Publishing Information: | St. Joseph, MI: American Society of Agricultural Engineers |
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| # of Pages: | 12 |
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| Keywords: | TIC Keywords: ANOVA; Canopy reflectance; Canopy temperature; Chlorophyll content; Chlorophyll meters; Color evaluation; Cynodon dactylon x Cynodon transvaalensis; Evaluative methods; Growth analysis; Hybrid bermudagrasses; Irrigation program; Leaching fractions; Nutrient concentration; Nitrogen; Nitrogen fertility; Nitrogen level; Normalized Difference Vegetation Index; Physiological responses; Remote sensing; Spectral reflectance; Tissue testing; Visual evaluation; Water absorption; Water balance; Water conservation; Water potential; Water use efficiency; Xylem water potential
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| Cultivar Names: | Tifway |
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| Abstract/Contents: | "Remote sensing technology was tested as a non-destructive tool to assess the nitrogen (N) and water status of hybrid bermudagrass 'Tifway' [ Cynodon dactylon (L.) Pers. ΠC. transvaalensis Burtt-Davy]. Ten combinations of water (based on leaching fraction: LF) and N treatments including cyclic and steady treatments were imposed on 20 plots (6.1 Π6.1 m) from October 2001 to October 2002 and January 2003 to June 2003 . Each plot contained a non-weighing lysimeter which was used to assess the weekly water balance. Leaf xylem water potential, canopy temperature, tissue moisture content (TM), chlorophyll meter index, visual color ratings, and tissue nitrogen concentration (TN) were assessed twice per month. Canopy spectral reflectance measurements were also acquired twice per month using a portable spectroradiometer mounted on a movable cart. Analysis of variance (ANOVA) showed that spectral reflectance at individual wavelengths, vegetation indices, and soil-plant parameters separated based on N, LF and/or N ΠLF interaction (P < 0.05). Prediction equations for individual wavelengths and vegetation indices were generated from plant and soil parameters that included TN (Nitrogen Content index (NC): R2 = 0.73), TM (R555 : R2 = 0.66), or TM ΠTN (Normalized Difference Vegetation Index (NDVI) : R2 = 0.71). Multiple regression analysis also produced significant predictive models for four plant variables based on a selected number of wavelengths (between 3 and 9): canopy color (R2 = 0.48), TN (R2 = 0.56), TM ΠTN (R2 = 0.43), and chlorophyll meter index (R2 = 0.78). Normalized difference vegetation index (NDVI) showed a strong threshold relationship with canopy color rating (R2 = 0.64, P < 0.001, n = 194) and a consistent positive curvilinear relationship with the chlorophyll meter index (R2 = 0.75, P < 0.001, n = 200). The Water Band Index (WBI) significantly correlated with TM (R2 = 0.76, P < 0.001) and N content index (NC) correlated with TN (R2 = 0.45, P < 0.001) for single day measurements, but not for the larger data sets. Results from this experiment demonstrate that canopy reflectance measured with a ground-based spectroradiometer has potential for improving turfgrass N and irrigation management under field conditions, which could lead to significant N and water savings on large turfgrass areas such as golf courses and sports fields." |
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| Language: | English |
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| References: | 46 |
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| Note: | Tables
Graphs |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Baghzouz, M., D. A. Devitt, and R. L. Morris. 2007. Assessing canopy spectral reflectance of hybrid bermudagrass under various combinations of nitrogen and water treatments. Appl. Eng. Agric. 23(6):p. 763-774. |
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https://elibrary.asabe.org/azdez.asp?AID=24055&T=2
Last checked: 03/07/2016
Requires: PDF Reader |
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MSU catalog number: b3269147 |
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