PVT PLT OF A C172 LOST DIRECTIONAL CTL DURING TKOF ROLL RESULTING IN GOING OFF THE EDGE OF THE RWY BEFORE REGAINING ACFT CTL AND BRINGING THE ACFT BACK ONTO THE RWY WHERE THE TKOF WAS ABORTED.

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I DID NOT MAINTAIN DIRECTIONAL CTL DURING TKOF ROLL. CLRED FOR TKOF RWY 35. APPLIED FULL PWR. A FEW SECONDS INTO THE TKOF ROLL; THE PLANE VEERED SHARPLY TO THE L. I APPLIED BOTH BRAKES AND THEN REDUCED PWR TO IDLE. DURING THE ROLL TO THE L; THE L MAIN WENT OFF THE RWY SURFACE INTO THE ADJOINING GRASS. APPLYING R RUDDER AFTER THE PWR WAS REDUCED; THE PLANE WAS RETURNED TO THE RWY SURFACE. I NOTIFIED THE TWR THAT I WAS ABORTING THE TKOF AND WAS CLRED OFF THE RWY AT THE NEXT TXWY. NO DAMAGE OCCURRED TO THE PLANE OR TO ARPT FACILITIES. REVIEWING WHAT HAPPENED; I HAD NOT APPLIED A PROPER AMOUNT OF R RUDDER TO COUNTERACT THE L TURNING TENDENCY. I AM NOT SURE BUT I ALSO MAY HAVE HAD MY L FOOT APPLYING SOME PRESSURE ON THE L RUDDER OR BRAKE WHICH MAY HAVE MADE THE PROB WORSE. I HAVE REVIEWED MY SEAT POS AND THE RELATIVE PLACEMENT OF MY FEET ON THE RUDDERS VERSUS THE TOE BRAKES. I HAVE ALSO REVIEWED TKOF PROCS AND HAVE INCREASED AWARENESS OF THE NEED FOR R RUDDER INPUT ON THE GND ROLL AS WELL AS NEEDING IT AFTER LIFTOFF. I SHOULD HAVE REDUCED PWR FIRST AND THEN APPLIED THE BRAKES SO I HAVE REVIEWED TKOF EMER PROCS.