According to the pilot, prior to departure the airplane's hopper was "packed full" of seed. He taxied to the turf runway which was soft from recent rain and began the takeoff. The airplane rolled farther down the runway than the previous runs that day so he extended the flaps and the airplane became airborne. Just past the departure end of the runway, the landing gear dragged through the bean plants. The airplane flew another 50 yards until it began to settle into the field; the right wing contacted the beans and the airplane impacted terrain. Examination of the airplane revealed substantial damage to the right wing. The owner stated that the airplane was not loaded beyond the maximum gross weight; it was loaded to 7,000 lbs and the maximum gross weight was 8,000 lbs. It is likely that the airplane was too heavy to operate on the runway and the climb performance was decreased.