Switchgrass Harvested for Analysis (IMAGE) American Society of Agronomy Caption Harvesting switchgrass samples by hand for laboratory analysis. Samples are cut by hand to avoid contamination with soil or other debris. Credit M. Casler Usage Restrictions For use with story only 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.