A field experiment was conducted to study the spectral response pattern of determinate varieties (Vamban 1, ICPL 87 and CORG 9301) and indeterminate varieties (Co.5 and ICPL 88027) of red gram. The spectral reflectance increased steadily from 45 DAS upto 75 DAS and decreased thereafter. Indeterminate varieties exhibited higher reflectance than determinate varieties of red gram throughout the growing period. Infrared band and spectral vegetation indices like IR/R, IR-R. Perpendicular vegetation index (PVI) and Greeness Index (GI) were effective in discriminating the red gram varieties at 45 DAS.
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