Sampling Gases Above Biochar (IMAGE) American Society of Agronomy Caption Part of the experiment, in a temperature-regulated greenhouse, measured gas release from the manure with various coverings. Credit Brian Dougherty 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.