Soil profile of a test field: (IMAGE) University of Bonn Caption Samples the size of a brick were taken from the soil at different depths and the roots were then isolated, scanned and measured. Credit Photo: Johannes Siebigteroth/University of Bonn Usage Restrictions This image may be used together with the press release. License Original 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.