Soybean Stem, Leaves, Bean Pods, and Roots (image) University of California - Santa Barbara Share Print E-Mail Caption Pictured are soybean stem, leaves, bean pods, and roots. The roots contain nodules where bacteria accumulate and convert atmospheric nitrogen into ammonium, which fertilizes the plant. Credit Patricia Holden Usage Restrictions None Share Print E-Mail 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.