Relationships between NDVI and visual quality in cool-season turfgrass: I. Variation among species and cultivars.

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Show simple item record Bremer, Dale J. Lee, Hyeonju Su, Kemin Kelley, Steven J. 2011-10-18T16:08:16Z 2011-10-18T16:08:16Z 2011-10-18
dc.description.abstract Canopy spectral reflectance may provide an objective means to evaluate visual quality of turfgrass, but evaluations of visual quality may be confounded by differences in reflectance among species or cultivars. In this 3-yr study near Manhattan, KS, we examined effects of species and cultivars on relationships between normalized difference vegetation index (NDVI) and visual quality ratings in Kentucky bluegrass (Poa pratensis L., ‘Apollo’), two Kentucky bluegrass × Texas bluegrass (Poa arachnifera Torr.) hybrids (‘Thermal Blue’ and ‘Reveille’), and tall fescue (Festuca arundinacea Schreb., ‘Dynasty’). A broad range of visual quality was imposed on all four grasses through deficit irrigation and NDVI was measured using broadband spectral radiometry across this range for each grass. Distinct linear regression models of visual quality were found for each grass, and models were also distinct among years in each grass. Relationships between NDVI and visual quality were stronger in the bluegrasses (r2 = 0.41 to 0.83) because they had a greater range in quality under deficit irrigation than tall fescue. The 95% confidence intervals surrounding predictions of visual quality from NDVI ranged from ± 1.25 to 2.10 (on a 1 to 9 scale). Results indicated that the requirement to develop separate models for each grass and in each year, combined with relatively wide confidence intervals, represents a practical limitation to predicting visual quality with NDVI. en_US
dc.relation.uri en_US
dc.subject Normalized difference vegetation index en_US
dc.subject Turfgrass en_US
dc.subject Turf visual quality en_US
dc.title Relationships between NDVI and visual quality in cool-season turfgrass: I. Variation among species and cultivars. en_US
dc.type Article (author version) en_US 2011 en_US
dc.citation.doi doi: 10.2135/cropsci2010.12.0728 en_US
dc.citation.epage 2218 en_US
dc.citation.issue 5 en_US
dc.citation.jtitle Crop Science en_US
dc.citation.spage 2212 en_US
dc.citation.volume 51 en_US
dc.contributor.authoreid bremer en_US
dc.contributor.authoreid skeeley en_US
dc.contributor.authoreid hyeonju en_US

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