The pilot stated he made an approach to the sod area adjacent to runway 32 and he was not aware of the fact that the sod area was wet and soft. He applied collective pitch abruptly as he was taking off to a hover. The left skid became airborne and the right skid remained on the ground. The helicopter encountered dynamic roll over before the pilot could apply collective pitch and lateral cyclic. The helicopter rolled over on its right side. The pilot stated there were no anomalies with the airframe, flight controls, engine assembly and accessories.