Claim · model-written summary
Simulated 15-year mean maize yields had a significant bias higher than observations, with a mean bias error of 0.97 Mg ha−1.
- Outcome
- biase1
- Direction
- highere1
- Value
- 0.97 Mg ha−1e1
- Comparator
- observationse1
- Setting
- 13-state region of the U.S. Corn Belte0
Zea maysNot reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleTreatmentQualifier
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“used to simulate maize yield in a 13-state region of the U.S. Corn Belt”
e1“Simulated 15-yr mean yields had a significant bias that was higher than observations, with an mbe of 0.97 Mg ha−1 and a root-mean-squared error (rmse) of 1.75 Mg ha−1”
Title
Christopher J. Kucharik Earth Interactions 2003. doi:10.1175/1087-3562(2003)007<0001:eoapam>2.0.co;2
Other claims from this paper (14)
- Method / resource Simulated 15-year mean maize yields had a root-mean-squared error of 1.75 Mg ha−1.
- Association The spatial pattern of simulated mean bias error of raw yields was largely unresponsive to soil texture.
- Association The spatial pattern of simulated mean bias error of raw yields was largely unresponsive to optimum hybrid choices.
- Association The spatial pattern of simulated mean bias error of raw yields was largely unresponsive to planting dates.
- Association Simulated interannual maize yield variability showed a relatively weak response to changes in soil type.
- Association Simulated interannual maize yield variability was more responsive to planting date than to hybrid selection.
- Method / resource The correlation between observed and simulated yield residuals within 0.5° grid cells ranged from 0.0 to 0.6.
- Association The correlation between observed and simulated yield residuals increased as additional land management scenarios were included within grid cells.
- Association The correlations between observed and simulated yield residuals had a weak but significant relationship to reported harvested area (r2 = 0.36).
- Method / resource Simulated positive yield residuals averaged 18% over the region, compared with 13% for observations, so simulated interannual variability was larger than observed.
- Method / resource Simulated negative yield residuals averaged −21% over the region, compared with −17% for observations, so simulated interannual variability was larger than observed.
- Recommendation The impact of irrigation on maize yield in the western Great Plains must be accounted for in future modeling scenarios.
- Intervention effect Irrigation increased mean maize yields by 36% compared with rain-fed maize in the western Great Plains.
- Intervention effect Irrigation significantly decreased interannual maize yield variability compared with rain-fed maize in the western Great Plains.