Great Plains brought its national dealer meeting to Iowa this year, showcasing two new planters and a new disk that company officials say are a fit for Midwest row-crop operations. The Kansas-based company also unveiled a new air drill and announced an alliance with Kverneland, a European company, to offer a fertilizer spreader and line of plows through Great Plains’ U.S. dealer network.

The new Great Plains Ultra-Disk leans on a European design, but includes...