Purple Leaf Corn Needs Phosphorus (IMAGE) American Society of Agronomy Caption Maize plant showing symptoms of severe phosphorus deficiency in an unfertilized soil in western Kenya. Credit Andrew Margenot 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.