* First-half pretax profit falls 47 percent
* Risk provisions rise six-fold
* Tier 1 capital ratio rises to 10.9 percent.
(Adds detail, background)
VIENNA, Aug 31 (Reuters) - Austrian cooperative bank Raiffeisen Zentralbank reported a 47 percent fall in first-half pretax profit on Monday as bad debt provisions soared.
The bank, which owns emerging Europe's No.2 lender Raiffeisen International, said first-half pretax profit fell to 463 million euros ($665 million) as risk provisions rose six-fold compared to the same period a year ago.
The bank's tier 1 capital ratio -- a measure of financial strength -- rose to 10.9 percent by the end of June from 8.4 percent a year ago.
RZB, which is unlisted but a significant player on debt markets and the main funding source for its listed offshoot, got a 1.75 billion euro capital injection from the government in April in the form of participation capital, a non-voting variant similar to preference shares.
RZB has raised another 750 million euros in participation capital from shareholders -- regional cooperative banks -- and from outside investors.
(Reporting by Sylvia Westall; editing by John Stonestreet)