Terra Nitrogen Company LP reports that all ammonia and UAN units at its Verdigris, Okla., manufacturing facility are operating. The company had announced on Feb. 17, 2016, that it experienced an unscheduled outage for maintenance on one of the facility’s two ammonia plants, resulting in approximately one-half of the complex being shut down. The company completed the maintenance, and subsequently restarted the affected ammonia plant on March 17, 2016.