The pilot reported that, while landing on a soft grass runway, the airplane bounced during touchdown. He added that, as the airplane settled back to the runway, the nose wheel "hit a soft spot" in the turf, and the nose landing gear collapsed. The airplane sustained substantial damage to fuselage. The pilot reported that there were no preaccident mechanical failures or malfunctions with the airplane that would have precluded normal operation. The Federal Aviation Administration's Airplane Flying Handbook, FAA-H-8083-3A, contains a section titled "Soft Field Approach and Landing" which states: Touchdown on a soft or rough field should be made at the lowest possible airspeed with the airplane in a nose-high pitch attitude. In nose-wheel type airplanes, after the main wheels touch the surface, the pilot should hold sufficient back-elevator pressure to keep the nose wheel off the surface. Using back-elevator pressure and engine power, the pilot can control the rate at which the weight of the airplane is transferred from the wings to the wheels.