SMA ON IFR FLT PLAN CANCELS WHEN ESTABLISHED ON 5 MI FINAL AT UNCTLED ARPT. LANDS OPPOSITE TO TFC AND FORCES ACFT ON TKOF ROLL TO PULL OFF RWY ONTO GRASS. USING WRONG FREQ FOR POS ANNOUNCEMENTS.

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OCCURRENCE TOOK PLACE SHORTLY AFTER DUSK. NIGHT CONDITIONS PREVAILED. LNDG WX VFR. HOWEVER; HAZE RESTR VISIBILITY. I WAS FLYING A BORROWED ACFT ON AN IFR FLT PLAN. KNOXVILLE APCH CTL ADVISED TO EXPECT VECTORS FOR A VISUAL APCH TO THE KNOXVILLE DKX DOWNTOWN ARPT. DKX DOES NOT HAVE A CTL TWR IN OP. DUE TO THE WIDESPREAD HAZY CONDITIONS RESTRICTING VISIBILITY IN MANY QUADRANTS; I REQUESTED VECTORS FOR A LOC APCH TO RWY 26 AT DKX. WIND AT THE MAIN KNOXVILLE TYS ARPT 8 MI SW OF DKX WAS RPTED CALM. ATC VECTORED ME FOR THE LOC 26 APCH. I CANCELLED IFR WITH KNOXVILLE APCH AT THE RIZEN OM 5.1 MI FROM TOUCHDOWN WHEN I HAD THE RWY LIGHTS IN SIGHT. I SAW AN ACFT DEPART FROM RWY 8 AT DKX. IT TURNED L DURING CLIMBOUT AND PASSED WELL CLR OF MY POS ON THE LOC. I TUNED IN 126.6 USED FOR LCL TFC AND ASKED FOR ARPT ADVISORIES. THERE WAS NO REPLY AND SO I ANNOUNCED MY ARR ON FINAL FOR RWY 26. THE RWY WAS CLR AND I CONTINUED STRAIGHT IN AND LANDED ON RWY 26. AFTER I HAD SLOWED DOWN DURING ROLL-OUT I NOTICED A DARK-COLORED SINGLE-ENG HIGH WING ACFT PARKED CLR OF THE RWY ON THE GRASS TO THE L. AT THE FAR END OF THE ARPT A SECOND SINGLE-ENG HIGH-WING ACFT WAS HOLDING SHORT OF RWY 8 IN THE RUN-UP AREA. WHEN I GOT TO THE RAMP I NOTICED DURING MY SHUTDOWN CHK THAT THE RADIO WAS TUNED INCORRECTLY TO 126.5 INSTEAD OF 126.6. A PERSON STANDING ON THE RAMP SAID THAT THE PLANE I SAW PARKED ON THE GRASS CLR OF THE RWY HAD COMMENCED A TKOF ROLL ON RWY 8; THEN STOPPED AND PULLED OFF CLR OF THE RWY WHEN THEY SAW MY ACFT APCHING ON FINAL. THAT PLANE WAS NO LONGER THERE AND HAD PRESUMABLY TAKEN OFF WHILE I TAXIED IN. I RPT THIS OCCURRENCE IN THE INTEREST OF SAFETY AWARENESS; BECAUSE MY PROC IN THIS CASE COULD HAVE LED TO AN UNSAFE SITUATION. I WAS ON AN INST APCH AT NIGHT IN HAZE TO AN ARPT THAT I DO NOT USE REGULARLY. POOR COCKPIT LIGHTING; AND THE TRANSITION FROM AN IFR FLT TO VFR AT THE OM AT A TIME WHEN I WAS ALSO CONCERNED WITH LNDG GEAR AND OTHER FINAL CHKS; CONTRIBUTED TO TUNING THE RADIO TO THE ARPT ADVISORY CHANNEL ON AN INCORRECT FREQ. USUALLY WHEN MAKING IFR APCH TO UNCTLED ARPTS I WILL DSND UNTIL VFR AND VISUAL CONTACT IS MADE WITH THE RWY. THEN OVERFLY THE ARPT AND JOIN THE TFC PATTERN. THERE ARE MANY PLTS MAKING INST APCH AND LNDG STRAIGHT IN AT UNCTLED FIELDS AROUND THE COUNTRY. I WILL NEVER DO THAT AGAIN IF THE WX OVER THE FIELD IS VFR. THIS TOPIC SHOULD BE STRESSED AT PLT SEMINARS AND FLT INSTRUCTOR REFRESHER COURSES. INST STUDENTS SHOULD BE CAUTIONED ABOUT THE HAZARDS OF IFR APCHS AND STRAIGHT-IN LNDGS AT UNCTLED ARPTS. PRIVATE PLTS AND STUDENTS SHOULD ALSO BE AWARE THAT IFR ACFT MAY MAKE UNANNOUNCED APCHS AGAINST THE FLOW OF TFC DURING MARGINAL VFR WX.