The aircraft had been engaged in spreading operations during the morning and after a meal break, the aircraft was re-loaded and refuelled. At about 1500 hours the pilot began spreading superphosphate over selected areas either side of a low ridge In gently undulating country. In fine and calm weather conditions the spreading runs were made in a left hand pattern with a run in a north-easterly direction over one area and continuing in the pattern for a run in a south-westerly direction over the other areas while gradually working upslope towards the central ridge area. After making a run to the north-east the pilot commenced a turn to the left to position the aircraft for a run to the south-west and it was then seen to dive steeply toward the ground while dumping its load. The aircraft struck the ground in a right wing down attitude and came to rest about 105 feet from the Initial Impact point. An examination of the wreckage disclosed that the engine was under power at the time of the impact, and that the flaps were extended, probably at the 40 degree position.