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Alfalfa Fiber Estimation in Mixed Stands and Its Relationship to Plant Morphology

Dep. of Crop and Soil Sci., Cornell Univ., Ithaca, NY 14853

View larger version (14K): [in a new window]   Fig. 1. Components of mean squared deviation (MSD) of regression models used to estimate the neutral detergent fiber of the alfalfa component of mixed stands. The equations used are PEAQ (Hintz and Albrecht, 1991), NYPQ (Cherney and Sulc, 1997), NYHT (Parsons et al., 2006a), and NYGD (Parsons et al., 2006a). LC, lack of correlation; NU, nonunity slope; SB, squared bias.

View larger version (18K): [in a new window]   Fig. 2. Comparison of regression models used to estimate the neutral detergent fiber (NDF) of the alfalfa component of mixed stands. The equations used are PEAQ (Hintz and Albrecht, 1991), NYPQ (Cherney and Sulc, 1997), NYHT (Parsons et al., 2006a), and NYGD (Parsons et al., 2006a). The line from lower left to upper right is the 1:1 unity line indicating a perfect fit.

View larger version (22K): [in a new window]   Fig. 3. Biplot for sample means and variables. Sample points, signified by a letter and number, are composed of mixes of alfalfa and orchardgrass (O), alfalfa and timothy (T), alfalfa and reed canarygrass (R), pure-sown alfalfa (A), Harvest 1 (1), and Harvest 2 (2). The variables include leaf-to-stem mass ratio (LSR), length of Internode 1 (IN1), length of Internode 2 (IN2), grass yield (Grass), alfalfa yield (Alfalfa), bluegrass yield (Bluegrass), alfalfa stem diameter (Diameter), alfalfa height (Height), number of alfalfa nodes (Nodes), alfalfa leaf neutral detergent fiber (LNDF), and alfalfa stem neutral detergent fiber (SNDF).