Multiple Cropping System Study Area (IMAGE) American Society of Agronomy Caption Fossil energy use was compared among three different crop rotation systems in a field experiment conducted between 2003 and 2008 in Boone Co., Iowa. Credit David N. Sundberg Usage Restrictions None 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.