Nitrogen chambers (IMAGE) American Society of Agronomy Caption Static chambers are used in fields to measure greenhouse gases. This helps scientists determine the effect of fertilizers on improving nitrogen use efficiency. Credit Shu Kee Lam 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.