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In-Season Prediction of Potential Grain Yield in Winter Wheat Using Canopy Reflectance

^a Dep. of Plant and Soil Sci., Oklahoma State Univ., Stillwater, OK 74078
^b Dep. of Biosystems and Agric. Eng., Oklahoma State Univ., Stillwater, OK 74078
^c USDA-ARS, Lincoln, NE 68583

View larger version (18K): [in a new window]   Fig. 1 Schematic relationship (Rickman et al., 1996) between aboveground dry mass (estimated using NDVI) obtained at two stages of growth (T1 and T2) and the cumulative growing degree days (GDD). Calculation of in-season estimated yield (EY) is also shown

View larger version (27K): [in a new window]   Fig. 2 Relationship between in-season estimated grain yield (EY) computed from two postdormancy NDVI readings divided by the cumulative growing degree days (GDD) (from Time-1 to Time-2) and measured grain yield in nine winter wheat experiments, 1998 and 1999 (confidence limits for point estimates about the exponential model)

View larger version (22K): [in a new window]   Fig. 3 Relationship between in-season estimated grain yield (EY) computed from two postdormancy NDVI readings divided by the cumulative growing degree days (GDD) (from Time-1 to Time-2) and measured grain yield in six of nine winter wheat experiments, 1998 and 1999 (confidence limits for point estimates about the exponential model)