Center pivot irrigation (IMAGE) Penn State Caption The study site in Nebraska is representative of agricultural management practices in the region and represents the most densely irrigated area in the Central Plains, which is a subregion of the Great Plains. Credit Suat Irmak, 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.