On October 25, 1995, at 0900 central daylight time, a Cessna 170B, N4555C, flown by a private pilot nosed over in a corn field during a forced landing on takeoff from a grass strip in Oconomowoc, Wisconsin. The 14 CFR Part 91 personal flight was operating in visual meteorological conditions without a flight plan. The pilot received minor injuries. The airplane was substantially damaged. This was a local flight which originated approximately one hour prior to the acicdent. The pilot stated that after a local flight, he returned to the Oconomowoc Airstrip where he performed a touch and go on runway 09 (1,000 long, sod). He stated that after the second landing, he applied power and initiated a takeoff climb. He stated that the engine "did not seem to develope adequate power (tach aprx 1000 rpm)... ." He stated he performed a straight ahead emergency landing into a corn crop. The airplane nosed over during the landing. The airplane was inspected by a Federal Aviation Airworthiness Inspector who was able to start the engine and run it up to 1,950 to 2,000 rpm.