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The ability to estimate plant water content may provide valuable information to environmental and irrigationsystem managers to relieve dehydration symptoms and prevent permanent growth and production damage. Aportable spectroradiometer was used to gather hyperspectral reflectance data from three plant species (corn, spinachand snap beans) grown in a greenhouse and subjected to different watering conditions to instigate different levels ofmoisture deficiency. Spectral bands at 950-970, 1150-1260, 1450, 1950, and 2250 nm and five indices (WI, NDVI,SIPI, fWBI, and WI/NDVI) were analyzed to determine the best method of nondestructively estimating plant watercontent. In corn and snap beans, the 1450 nm band data provided the best estimate (r2 = 0.67 and 0.50). In spinach,reflectance data from the 950-970 nm bands were the most useful (r2 = 0.94).
Jones et al. (Thu,) studied this question.