Soil Cores (IMAGE) American Society of Agronomy Caption Soil cores with hairy vetch roots inside, ready to be buried in the field. After they are pulled back up, the soil will be washed off and the root biomass measured to look at rates of decomposition. Credit Taylor Sievers. 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.