Prior to the aerial application flight, the airplane was loaded with about 3,400 pounds (lbs) of dry fertilizer and contained about 140 gallons of fuel. The airplane’s estimated weight at the time of the accident was 9,000 lbs, with a maximum gross weight of 9,400 lbs. The pilot reported the temperature was about 95° F, the wind was from 150°; about 6 knots, and runway 35 was rough with tall grass. The calculated density altitude was about 3,900 ft. During the takeoff, the pilot attempted to rotate; however, "the aircraft was not ready to fly." The airplane impacted a field about 500 ft north of the runway. The airplane sustained substantial damage to the forward fuselage. The pilot reported that there were no preaccident mechanical failures or malfunctions with the airplane that would have precluded normal operation. The pilot's recommendation to prevent the accident was "carry lighter loads, less fuel on hot days."