No Arrow (IMAGE) American Society of Agronomy Caption This image with multiple canola roots illustrates the effect of urea rate. The damage increases from left to right, corresponding to an increase in the urea rate. The roots on the right are shorter and have more signs of damage. Credit Justin Archibald Usage Restrictions For 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.