Soy Root Nodules (IMAGE) American Society of Agronomy Caption A soybean root with nodules, These nodules house bacteria that "fix," or extract, nitrogen from the atmosphere for the plant's use. Credit Luiz G. Moretti. 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.