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Effectiveness of RZWQM for Simulating Alternative Great Plains Cropping Systems

^a USDA-ARS, 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
^c USDA-ARS, Soil Plant Nutrient Res., 2150 Centre Ave., Bldg. D, Suite 100, Fort Collins, CO 80526

View larger version (34K): [in a new window]   Fig. 1. Measured and predicted (RZWQM) total profile (180 cm) soil water under wheat fallow (WF) for the beginning wheat data set: (a) conventional tillage (CT), (b) no-till (NT), (c) comparison of predicted soil water under WF(CT) and WF(NT), and (d) comparison of measured soil water under WF(CT) and WF(NT).

View larger version (34K): [in a new window]   Fig. 2. Measured and predicted (RZWQM) total profile (180 cm) soil water under wheat fallow (WF) for the beginning fallow data set: (a) conventional tillage (CT), (b) no-till (NT), (c) comparison of predicted soil water under WF(CT) and WF(NT), and (d) comparison of measured soil water under WF(CT) and WF(NT).

View larger version (36K): [in a new window]   Fig. 3. Comparison between measured and RZWQM-predicted total profile (180 cm) soil water under wheat–corn–fallow no-till [WCF(NT)] beginning with (a) wheat, (b) corn, and (c) fallow phases in 1992.

View larger version (37K): [in a new window]   Fig. 4. Model simulations of residue dynamics and residue effects on soil evaporation from conventional till (CT) and no-till (NT) systems in the wheat–fallow cropping system (beginning fallow data set): (a) flat residue mass on the soil surface, (b) residue evaporative resistance, and (c) potential soil evaporation.

View larger version (23K): [in a new window]   Fig. 5. Comparison between measured and predicted (RZWQM) wheat evapotranspiration (ET) for wheat–fallow (WF) cropping systems in beginning fallow (WF-F) and beginning wheat (WF-W) data sets. Error bars show one standard deviation about the mean of measured ET. CT, conventional till; NT, no-till.

View larger version (15K): [in a new window]   Fig. 6. Comparison between measured and predicted (RZWQM) wheat and corn evapotranspiration (ET) for the wheat–corn–fallow (WCF) cropping system in the beginning wheat (WCF-W), beginning corn (WCF-C), and beginning fallow (WCF-F) data sets. Error bars show one standard deviation about the mean of measured ET.

View larger version (24K): [in a new window]   Fig. 7. Comparison between measured and predicted (RZWQM) wheat grain yields for the wheat–fallow (WF) cropping systems in beginning fallow (WF-F) and beginning wheat (WF-W) data sets. Error bars show one standard deviation about the mean of measured yield. CT, conventional till; NT, no-till.

View larger version (22K): [in a new window]   Fig. 8. Comparison between measured and predicted (RZWQM) wheat and corn grain yield for the wheat–corn–fallow (WCF) cropping system in the beginning wheat (WCF-W), beginning corn (WCF-C), and beginning fallow (WCF-F) data sets. Error bars show one standard deviation about the mean of measured yield.

View larger version (24K): [in a new window]   Fig. 9. Comparison between measured and predicted (RZWQM) wheat biomass for the wheat–fallow (WF) cropping systems in beginning fallow (WF-F) and beginning wheat (WF-W) data sets. Error bars show one standard deviation about the mean of measured biomass. CT, conventional till; NT, no-till.

View larger version (21K): [in a new window]   Fig. 10. Comparison between measured and predicted (RZWQM) wheat and corn biomass for the wheat–corn–fallow (WCF) cropping system in the beginning wheat (WCF-W), beginning corn (WCF-C), and beginning fallow (WCF-F) data sets. Error bars show one standard deviation about the mean of measured biomass.