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Dr. Chang is a Senior Lecturer in Agronomy, Horticulture, and Plant Science Department, South Dakota State University. He has been working for Precision Agriculture projects since his Master’s. His main works were i) describing/analyzing spatial/temporal variation of crop yields and soil nutrients in crop fields to identify agronomic problems, ii) using images collected by satellites, airplanes, or drones to identify stressed crop plants by water, weeds, insects, or disease, and iii) making variable rate application maps of fertilizers and seeds using GIS software.