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Predicting Forage Quality in Switchgrass and Big Bluestem

^a Dep. of Range, Wildlife, and Fisheries Management, Texas Tech Univ., Lubbock, TX 79409
^b Dep. of Agron., Kansas State Univ., Manhattan, KS 66506
^c Dep. of Agron., Iowa State Univ., Ames, IA 50011
^d Dep. of Agron., Univ. of Nebraska, Lincoln, NE 68583
^e USDA-ARS, Dep. of Agron., Univ. of Nebraska, Lincoln, NE 68583
^f Louisiana State Univ. Agric. Cent., Southeast Res. Stn., Franklinton, LA 70438

View larger version (24K): [in a new window]   Fig. 1 Accumulated growing degree days (GDD) for calibration and validation studies near Mead, NE in 1990, 1991, 1992, and 1993 and Manhattan, KS in 1992 and 1993

View larger version (25K): [in a new window]   Fig. 2 Calibration parameters that best predicted in vitro digestible dry matter (IVDDM) for switchgrass and big bluestem grown near Mead, NE in 1990 and 1991. Equation of the line is given in Table 1

View larger version (25K): [in a new window]   Fig. 3 Calibration parameters that best predicted crude protein (CP) concentration for switchgrass and big bluestem grown near Mead, NE in 1990 and 1991. Equation of the line is given in Table 1

View larger version (25K): [in a new window]   Fig. 4 Calibration parameters that best predicted neutral-detergent fiber (NDF) concentration for switchgrass and big bluestem grown near Mead, NE in 1990 and 1991. Equation of the line is given in Table 1