Field Experiment at Thünen Institut (IMAGE) Cell Press Caption Field experiments require high-tech installations, e.g., for CO2 enrichment in open field experiments, here at Thünen Institut, Braunschweig, Germany. Credit H. Stützel Usage Restrictions Credit Required. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.