Wheat Canopy (IMAGE) American Society of Agronomy Caption A student uses the GreenSeeker active canopy sensor in a winter wheat field. The collected data will help determine the crop's nitrogen status. Credit Yuxin Miao 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.