TOKYO, April 6 (Reuters) - Yields on most Japanese government bonds (JGBs) fell on Tuesday after an auction of 30-year notes received solid demand, assuaging concerns about low demand for debt at the beginning of the new fiscal year. The 10-year JGB yield fell 0.5 basis point to 0.110%, while the 20-year JGB yield dipped 0.5 basis point to 0.485%. The 30-year JGB yield fell one basis point to 0.685%. The five-year yield was flat at minus 0.085%. Benchmark 10-year JGB futures rose 0.13 point to 151.18, with a trading volume of 17,050 lots. (Reporting by Tokyo markets team, Editing by Sherry Jacob-Phillips)