Switchgrass Harvesting (IMAGE) American Society of Agronomy Caption Scientists harvest switchgrass planted at the University of Tennessee, Knoxville. The field trial was established in 1992 by researchers from Virginia Tech to examine biomass production across a five-state region. That study ultimately spanned ten years and compared yield of six cultivars produced under two harvest management regimes. Credit Wullschleger, S. D. 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.