The pilot stated that this was his third passenger carrying flight of the day and he determined his takeoff weight was about 146 lbs below max gross weight. For the takeoff from the grass strip, he elected not to utilize flaps or the full length of the runway, leaving about 100-200 ft behind him. During the takeoff roll, the pilot had the sense that the roll was taking longer than normal, and he began to be concerned about powerlines at the end of the runway. When about 10-25 ft above the ground, he began a shallow bank turn to the right. Immediately after starting the turn, he flew over a corn field and experienced a loss of lift. The airplane then impacted the corn, resulting in substantial damage to the right wing and fuselage. The pilot reported no mechanical anomalies with the airplane that would have precluded normal operation. The pilot noted that he listened to the density altitude reported on the Automated Weather Observing System for a nearby airport but did not process the effects it would have on the accident flight. The density altitude was about 6,184 ft.