We wish to thank Dr. John Lindquist of the University of Nebraska for providing field data on maize development and growth for model validation. We also thank Larry McDaniel of the National Center for Atmospheric Research for technical and computer support. We acknowledge the High Plains Climate Center of the University of Nebraska for providing the data set of observed climate for the Great Plains used in this study. We acknowledge the National Drought Mitigation Center of the University of Nebraska for providing the data for the Standardized Precipitation Index. Finally, we thank Dr. A. Weiss of the University of Nebraska and anonymous reviewers for useful editorial comments. The National Center for Atmospheric Research is sponsored by the National Science Foundation.
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