Shortly after the take-off run was commenced, a large stone was thrown up by the right mainwheel and struck the spray boom. The pilot dumped the load and returned for a landing. The strip was rough and undulating and during the landing roll the aircraft overran a depression and became airborne. The right main gear VEE assembly tube failed in overload when the aircraft subsequently landed heavily. The right wing then struck the ground and the aircraft ground looped. The pilot turned off the electrical system and vacated the aircraft, but shortly afterwards a fire broke out and consumed the aircraft.
