Table 1.
Full name and abbreviation (Abbr.) of the spectral reflectance indices (SRI) used in this study and formulated using VIS/VIS, NIR/VIS, and NIR/NIR of the spectrum.
Table 2.
Full name and abbreviation (Abbr.) of the spectral reflectance indices (SRI) used in this study and formulated using NIR/SWIR and SWIR/SWIR of the spectrum.
Table 3.
Effects of irrigation rate, cultivar, and their interaction on selected vegetative growth parameters measured at the anthesis growth stage in two growing seasons.
Table 4.
Effects of irrigation rate, cultivar, and their interaction on photosynthetic parameters measured at the anthesis growth stage in two growing seasons.
Table 5.
Pearson’s correlation matrix of vegetative growth and photosynthetic parameters across two years and three cultivars (n = 18) under each water irrigation rate.
Fig 1.
The changes in the shape of reflectance spectra of three cultivars under different irrigation rates in the range between 350 and 2500 nm of spectrum.
Table 6.
The best equations and determination coefficients of the relationships across all data (n = 27) between spectral reflectance indices (SRIs) based on the reflectance in VIS/VIS and NIR/VIS and the parameters (par.) of total shoot dry weight per plant (TDW), net photosynthesis rate (Pn), stomatal conductance (Gs), and transpiration rate (E).
Table 7.
The best equations and determination coefficients of the relationships across all data (n = 27) between spectral reflectance indices (SRIs) based on the reflectance in NIR/NIR, SWIR/NIR and SWIR/SWIR and the parameters (par.) of total shoot dry weight per plant (TDW), net photosynthesis rate (Pn), stomatal conductance (Gs), and transpiration rate (E).
Fig 2.
Relationships between transpiration rates and spectral reflectance indices based on the reflectance in VIS/VIS and NIR/VIS regions for 1.00 ETc (green), 0.75 ETc (yellow) and 0.50 ETc (red) treatments.
Data correspond to the three cultivars and three replications for each irrigation rate. *,**, ***Significant at the .05, .01, and .001 probability levels, respectively, and ns: not significant.
Fig 3.
Relationships between transpiration rates and spectral reflectance indices based on the reflectance in NIR/NIR, SWIR/NIR and SWIR/SWIR regions for 1.00 ETc (green), 0.75 ETc (yellow) and 0.50 ETc (red) treatments.
Data correspond to the three cultivars and three replications for each irrigation rate. *,**, ***Significant at the .05, .01, and .001 probability levels, respectively, and ns: not significant.