Tractor no till (IMAGE) Penn State Caption This high-residue cultivator was used in the research to control weeds between the soybean rows in the reduced herbicide treatment fields to eliminate an herbicide application after the crop and inter-row weeds had emerged. 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.