THE PILOT WAS ATTEMPTING A TAKEOFF FROM A WET SOD STRIP WITH A FULL LOAD OF CHEMICALS. AFTER THE AIRPLANE FAILED TO ACCELERATE TO LIFTOFF SPEED, THE PILOT ELECTED TO DUMP THE CHEMICALS; THE AIRPLANE BROKE GROUND AND FLEW BRIEFLY. THE PILOT CONTINUED THE CLIMBOUT BUT NEVER GAINED ENOUGH ALTITUDE TO CLEAR TREES SURROUNDING THE SOD STRIP. NO MECHANICAL PROBLEMS WERE REPORTED BY THE PILOT.