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Regression-Based Evaluation of Ecophysiological Models

^a USDA-ARS, Arid Land Agricultural Research Center, 21881 N Cardon Ln., Maricopa, AZ 85239
^b Agronomy Dep., P.O. Box 110500, Gainesville, FL 32611
^c Dep. of Biological and Agricultural Engineering, Univ. of Georgia, Griffin, GA 30223-1797
^d CIAT, Apartado Aéreo 6713, Cali, Colombia

View larger version (13K): [in this window] [in a new window]   Fig. 1. Box-and-whisker plots for mean temperatures, daylength, solar radiation and total season precipitation for the 28 experiments from 11 locations considered in the simulations with the CSM-CROPGRO-Soybean model and the regressions. The lower and upper limits of the boxes indicate the first and third quartiles, and the T-bars indicate the minimum and maximum values.

View larger version (24K): [in this window] [in a new window]   Fig. 2. Comparison of observed vs. simulated values for days to anthesis and final grain yield for the CSM-CROPGRO-Soybean model in 28 experiments from 11 locations.

View larger version (23K): [in this window] [in a new window]   Fig. 3. Comparison of residuals from regressions of observed vs. simulated values for days to anthesis for the CSM-CROPGRO-Soybean model in 28 experiments from 11 locations. A, Relation with mean temperature during vegetative phase; B, Relation with mean daylength during vegetative phase.

View larger version (29K): [in this window] [in a new window]   Fig. 4. Comparison of residuals from regressions of observed vs. simulated values for days to anthesis for the CSM-CROPGRO-Soybean model in 28 experiments from 11 locations. A, relation with mean temperature during vegetative phase; B, relation with mean daylength during vegetative phase; C, relation with mean water stress indicator during reproductive phase; D, Relation with simulated days to anthesis.