Corn Field with Nitrogen Fertilizer (IMAGE) Frontiers Caption This is a corn field with Nitrogen fertilizer supplements (white balls) in Midwest USA. Credit Image granted by Laila Puntel. Usage Restrictions None 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.