tubes in buckets (IMAGE) American Society of Agronomy Caption The assembled loamy soil experimental buckets at the beginning of the experiment. PVC tubes with rust paint and wooden sticks were used to track oxygen and decomposition. Credit M.C. Rabenhorst Usage Restrictions For use with this 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.