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Figure 6. Quadratic-plateau functions describing the relationship between alfalfa yield and blue-based vegetative indices (blue normalized difference vegetation index [BNDVI] and blue-wide dynamic range vegetation indices [BWDRVIs] calculated using one of three near-infrared [NIR] reflectance-scalars [‘
’ = 0.1, 0.05, and 0.01]). Canopy reflectance measurements from which the indices are calculated were made 1 d before each of the five harvests during 2005 using the FieldScan. Observations for a given harvest consist of the mean VI and total plot yield measured from each plot (n = 80).
