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Simulating Soybean Water Stress Effects with RZWQM and CROPGRO Models

^a USDA-ARS, Cent. Great Plains Res. Stn., 40335 County Rd. GG, Akron, CO 80720
^b USDA-ARS, Great Plains Syst. Res. Unit, 301 S. Howes, Ft. Collins, CO 80522
^c Dep. of Biol. and Agric. Eng., Univ. of Georgia, Griffin, GA 30223-1797

View larger version (20K): [in a new window]   Fig. 1. Measured and simulated leaf area index, plant height, and aboveground biomass from Irrigation Level 4 (wettest) of the 1985 line-source gradient irrigation data set (used to calibrate RZWQM and CROPGRO-Soybean for soybean production in northeast Colorado). Bars are ± one standard deviation.

View larger version (16K): [in a new window]   Fig. 2. Measured and simulated (CROPGRO-Soybean) leaf number and R-stages for the calibration data set (1985 line-source gradient irrigation experiment, Irrigation Level 4), Akron, CO.

View larger version (34K): [in a new window]   Fig. 3. Measured and simulated volumetric soil water content by soil layer from Irrigation Level 4 of the 1985 line-source irrigation data set with soybean at Akron, CO.

View larger version (38K): [in a new window]   Fig. 4. Measured vs. simulated soil water extraction from the 0- to 180-cm soil profile by soybean at Akron, CO (first half of growing season is before 1 August). Bold diagonal line is 1:1 line. LS, line-source gradient irrigation experiment; RO, rainout shelter experiment; Drip, drip irrigation experiment.

View larger version (22K): [in a new window]   Fig. 5. Measured vs. simulated soybean evapotranspiration (ET), Akron, CO. Bold diagonal line is 1:1 line. LS, line-source gradient irrigation experiment; RO, rainout shelter experiment; Drip, drip irrigation experiment.

View larger version (25K): [in a new window]   Fig. 6. Measured vs. simulated soybean yield, Akron, CO. Bold diagonal line is 1:1 line. LS, line-source gradient irrigation experiment; RO, rainout shelter experiment; Drip, drip irrigation experiment.