Soil Sample (IMAGE) American Society of Agronomy Caption This large 5 liter core sample from a grassland will be used for soil structural measurements. Credit Ole Wendroth. Usage Restrictions Please 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.