Larry Hendrickson1, Gaylia Ostermeier1, and John E. Sawyer2. (1) John Deere Company, John Deere AMS, 4140 114th Street, Urbandale, IA 50322, (2) Agronomy, Iowa State University, Ames, IA 50011
John Deere now provides aerial images for a variety of agricultural applications, including nitrogen management on various crops. This presentation will briefly summarize the JD image acquisition technology and recent results from replicated N trials conducted across Iowa. Although aerial images are closely related to SPADs in these fields, a better relationship occurs between the images and corn grain yields than to SPAD measurements. As such, new methods are being developed to provide reliable N management decisions from images without accompanying SPAD measurements. These methods also eliminate the requirement for high N reference strips or at least information about their location within a field. Also provided is a field ranking tool based upon the severity and extent of apparent N stress, enabling remedial N applications to those fields most likely to benefit.