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. Relative chlorophyll content measured with a SPAD-502 chlorophyll meter (Konica Minolta, Tokyo, Japan), MC-100 chlorophyll meter (Apogee Instruments, Logan, UT), and normalized difference vegetation index (NDVI) sensors (Apogee Instruments) under halogen

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monitored by measuring the normalized difference vegetation index (NDVI) using a Field Scout® TCM 500 “NDVI” turf color meter (Spectrum Technologies, Inc., Plainfield, IL) daily for each drying pot. The instrument was placed directly on the turfgrass because

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quality assessment of groundcovers is mostly based on the visual ratings ( Nazemi Rafi et al. 2019 ; Pittenger et al. 2001 ), and the potential use of quantitative quality predictor, including normalized difference vegetation index (NDVI) has not been

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The normalized difference vegetation index (NDVI) provides relative estimates of vegetation vigor, density, and health. Little information is available on the application of NDVI imagery for citriculture. The objective of this study was to evaluate airborne NDVI imagery for assessing tree conditions in citrus (Citrus spp.) orchards. Images of two south Texas citrus groves with stressed and nonstressed trees were qualitatively evaluated. Stressed trees were easily detected from nonstressed trees in the images. The images were also helpful for developing survey plans of the citrus groves. Our results indicated that airborne NDVI images could be used as a tool to assess tree conditions in citrus orchards. Findings should be of interest to citrus growers, extension agents, agricultural consultants, and private surveying companies.

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order from highest to lowest average NDVI value. Table 1. Minimum, maximum, and average normalized difference vegetation index (NDVI) for metropolitan statistical areas (MSA), ranked in order highest to lowest average NDVI in the study of the effect of

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photosynthetically active radiation absorbed by plant canopies ( Asrar et al., 1984 ; Daughtry et al., 1992 ; Goward and Huemmrich, 1992 ; Johnson and Scholasch, 2005 ). Spectral indices such as the normalized difference vegetation index (NDVI), derived as the

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recorded at the end of the study. Plant growth data were recorded from each plant used in the study. Normalized difference vegetation index. The NDVI was recorded using a handheld FieldScout CM 1000 NDVI meter (Spectrum Technologies Inc., Aurora, IL

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) Normalized Difference Red-edge Index (NDRE), and ( F ) Modified Chlorophyll Absorption Reflectance Index (MCARI) and Normalized Difference Vegetation index (NDVI). The corresponding regression coefficients, adjusted R 2 values, and root mean square error

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NDVI revealed significant differences among the main effects of location and hybrid before the initiation of traffic, and no location × hybrid interaction was observed ( Table 2 ). Normalized difference vegetation index values at the Coastal Plain

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.R. Kenworthy, K. 2009 Transpiration and normalized difference vegetation index response of seashore paspalum to soil drying HortScience 44 2046 2048 Kim, K.S. Beard, J.B. 1988 Comparative turfgrass evapotranspiration rates and associated plant morphological

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