Knowing that farmers and reporters would inevitably call the little, computer-piloted plane a “drone,” the organizers of the field demonstration of a UAS, or “unmanned aerial system,” for farm use put both terms in the invitation. The demo, organized by Southern States Cooperative, was held on a recent morning outside the Nellwood Farm pondhouse near Brooklet. Brothers Chap and Hal Cromley, and Chap’s son David and Hal’s son Colby, operate Nellwood Farm.