SALINA, Kan.-Upon hearing no objection from the Justice Department or the Federal Trade Commission, two hospitals in Salina will merge. Asbury-Salina Regional Medical Center and St. John's Regional Health Center announced in October 1994 that they would consolidate assets and operations. On March 24, they submitted an application for federal review of potential antitrust implications. The 30-day review period expired April 24 without objection. The hospitals intend to complete the merger by Sept. 30. Together, they have revenues of about $75 million. St. John's, with 118 beds, is owned by CSJ Health System of Wichita, Kan., a Catholic-sponsored organization. Asbury-Salina, with 192 beds, is Methodist. The combined entity will have its own board of trustees and will be based in Salina. Clay D. Edmands, now president and chief executive officer of Asbury-Salina, will become CEO of the combined organization. Salina, population 42,000, lies in the Kansas wheat belt about 150 miles west of Kansas City.