Two growth systems (IMAGE) Heinrich-Heine University Duesseldorf Caption Two growth systems developed for the research into root microbiota. Left: CD-Rhizotron, in which the plants grow on soil and right: ArtSoil, in which plants grow on an agar matrix with properties similar to soil. (Image: HHU/ Eliza Loo) Credit HHU/ Eliza Loo Usage Restrictions No restrictions. License Public Domain 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.