The pilot was returning to the airport to land when the accident occurred. He was one mile from the airport when the engine lost power. The pilot performed a forced landing in a corn field during which, he suffered a broken arm. Post accident inspection of the airframe and engine failed to reveal any mechanical failure/malfunction which would have resulted in the loss of engine power. The pilot stated he did not use carburetor heat during the descent back to the airport. The local temperature and dewpoint were 27 degrees Celsius and 21 degrees Celsius respectively. These conditions were conducive to visible icing at rated power.