SEOUL, SOUTH KOREA, March 23 (Reuters) - South Korea plans to unveil measures on Tuesday to help ease the impact of a planned increase in government bond offerings on the domestic bond market, a senior finance ministry official told Reuters on Monday.

Choi Kyu-yun, head of the ministry's treasury bureau, said by telephone that the ministry would 'explain' how it would help sell the planned additional bonds to fund a supplementary budget of around 29 trillion won (S$29 billion).

(Reporting by Yoo Choonsik; Editing by Jonathan Hopfner)