Russell Ranch Soil Class at UC Davis (IMAGE) University of California - Davis Caption Researchers talk while a tractor moves across a field at the UC Davis Russell Ranch Sustainable Agriculture Facility in 2016. Credit Gregory Urquiaga/UC Davis Usage Restrictions Provide credit. 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.