Crops (IMAGE) Penn State Caption In the study, the conservation dairy-farming systems -- which have been developed and tested by Penn State researchers over the last decade -- produce the majority of the feed and forage crops consumed by their cattle, use no-till planting, have continuous diversified plant cover, and one system employs manure injection. Credit Karsten Research Group, 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.