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Cover: Old and new combine to advance the science of nitrogen management. Adam Dellinger drives a 1950s-era Farmall Super C equipped with a state-of-the-art active reflectance crop sensor, differentially corrected GPS unit, and computer data logging equipment through research plots at Penn State's Russell Larson Research Facility at Rock Spring, PA. Dellinger et al. (1546–1552) evaluated the relationship between the economic optimum nitrogen rate for corn and on-the-go reflectance measurements from an active sensor taken prior to sidedressing. Photo credit: Doug Beegle.