About the Authors
United States Department of Agriculture/Agricultural Research Service, Global Change and Photosynthesis Research Unit, Urbana, Illinois, United States of America
Department of Bioproducts and Biosystems Engineering, University of Minnesota, St. Paul, Minnesota, United States of America
Leopold Center for Sustainable Agriculture, Iowa State University, Ames, Iowa, United States of America
Department of Economics, Iowa State University Extension and Outreach, Osage, Iowa, United States of America
Department of Agronomy, Iowa State University, Ames, Iowa, United States of America
The authors have declared that no competing interests exist.
Conceived and designed the experiments: ASD ML. Performed the experiments: CAC AMJ ML. Analyzed the data: ASD JDH CAC AMJ ML. Contributed reagents/materials/analysis tools: ML. Wrote the paper: ASD JDH ML.