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Fig. 1. Accumulated growing degree days (GDD) for calibration and validation studies near Mead, NE in 1990, 1991, 1992, and 1993 andManhattan, KS in 1992 and 1993.
Table 1. Calibration equations, coefficients of determination, and root mean square errors (RMSE) for predicting forage quality withday of the year (DOY), accumulated growing degree day (GDD), mean stage count (MSC), and mean stage weight (MSW) forswitchgrass and big bluestem grown near Mead, NE in 1990 and 1991.
Fig. 4. Calibration parameters that best predicted neutral-detergentfiber (NDF) concentration for switchgrass and big bluestem grownnear Mead, NE in 1990 and 1991
Table 2. Validation of the switchgrass calibration equations for forage quality parameters (g kg�1) based on accumulated growing degreeday (GDD), day of the year (DOY), mean stage count (MSC), and mean stage weight (MSW) models for switchgrass grown nearMe

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