no till w/students (IMAGE) Penn State Caption Heather Bair, left, former environmental resource management student who graduated with a bachelor's degree, and Haleigh Summers, master’s degree student in plant science who spearheaded the research, are shown quantifying the density of weeds and oats in a cover crop in the fall. Credit Heather Karsten, Penn State Usage Restrictions non commercial use only License Original 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.