Cover Crop (IMAGE) Penn State Caption Cereal rye cover crop that was killed with glyphosate herbicide three weeks prior (left) and that will be killed after soybean planting. Credit Heather Karsten/Penn State Usage Restrictions non commercial use 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.