Manure Injection (IMAGE) Penn State Caption In a four-year study, shallow-disk injection of manure was found to result in less phosphorus loss in runoff from farm fields compared to broadcasting or spreading manure. The research findings have implications for Chesapeake Bay water quality. Credit Melissa Miller / 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.