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Simulating Planting Date Effects on Corn Production Using RZWQM and CERES-Maize Models

^a Great Plains Syst. Res., 2150 Centre Ave., Bldg. D, Suite 200, Fort Collins, CO 80526
^b USDA-ARS, Central Great Plains Res. Stn., 40335 County Rd. GG, Akron, CO 80720

View larger version (39K): [in a new window]   Fig. 1. Comparisons of measured leaf area index (LAI) progressions of PI 3902 corn hybrid at three planting dates in 1991 and 1992 with simulations by Root Zone Water Quality Model (RZWQM) and CERES-Maize. The first planting of 1991 was used to calibrate the models. Error bars represent one standard deviation about the means of measured LAI.

View larger version (39K): [in a new window]   Fig. 2. Comparisons of measured leaf area index (LAI) progressions of PI 3732 corn hybrid at three planting dates in 1991 and 1992 with simulations by Root Zone Water Quality Model (RZWQM) and CERES-Maize. The first planting of 1991 was used to calibrate the models. Error bars represent one standard deviation about the means of measured LAI.

View larger version (38K): [in a new window]   Fig. 3. Comparisons of measured leaf area index (LAI) progressions of PI 3540 corn hybrid at three plantings dates in 1991 and 1992 with simulations by Root Zone Water Quality Model (RZWQM) and CERES-Maize. The first planting of 1991 was used to calibrate the models. Error bars represent one standard deviation about the means of measured LAI.

View larger version (29K): [in a new window]   Fig. 4. Measured vs. predicted evapotranspiration (ET) for corn hybrids PI 3902, PI 3732, and PI 3540 at Akron, CO. Predicted values from simulations by the Root Zone Water Quality Model (RZWQM) and CERES-Maize. The six data points in each frame represent data from three planting dates in 2 yr (1991, 1992). Error bars represent one standard deviation about the means of the measured ET. The diagonal lines in the graphs are the 1:1 lines.

View larger version (28K): [in a new window]   Fig. 5. Measured vs. predicted grain (or silage) yield for corn hybrids PI 3902, PI 3732, and PI 3540 at Akron, CO. Predicted values from simulations by the Root Zone Water Quality Model (RZWQM) and CERES-Maize. The six data points in each frame represent data from three planting dates in 2 yr (1991, 1992). Error bars represent one standard deviation about the means of the measured yields. The diagonal lines in the graphs are the 1:1 lines.

View larger version (19K): [in a new window]   Fig. 6. Comparisons of measured reduction in corn grain yield with delay in planting of hybrids PI 3902, PI 3732 and PI 3540 with predictions by Root Zone Water Quality Model (RZWQM) and CERES-Maize at Akron, CO.

View larger version (27K): [in a new window]   Fig. 7. Mean simulated irrigated corn yields (1912–1999, Akron, CO) for hybrids PI 3902, PI 2732, and PI 3540 planted at weekly intervals from 1 April through 15 July. Simulations from CERES-Maize and Root Zone Water Quality Model (RZWQM).

View larger version (26K): [in a new window]   Fig. 8. Probabilities of achieving break-even corn yield goal (7000 kg ha–1) under irrigated conditions for plantings from 1 April through 15 July, derived from the long-term (1912–1999) simulations of hybrids PI 3902, PI 3732 and PI 3540 by CERES-Maize and Root Zone Water Quality Model (RZWQM).