* Czech, Polish bond yields fall in successful auctions
* Demand for Czech bond weaker after Eurobond last week
* Polish bond bid well, weak CPI tames rate rise prospects
By Jana Mlcochova
PRAGUE, Sept 15 (Reuters) - Poland and the Czech Republic sold 10-year bonds on Wednesday at lower yields than in previous auctions, indicating investor confidence in emerging Europe despite concerns about some more developed EU economies.
The two bond auctions, along with another successful debt sale in Germany, underscored how investors are differentiating between countries and asset classes to lock in higher returns in a period of high market volatility.
Compared with countries like Portugal and Ireland, which are struggling to push through painful austerity measures and manage huge piles of debt, Poland and the Czech Republic have much lower debt levels and their economies are recovering faster than expected this year.
The new centre-right Czech government has set out an ambitious fiscal consolidation plan, which is drawing investors to Czech bonds despite low official interest rates.
The Czechs sold all 5 billion crowns ($263.3 million) worth of benchmark nine-year bonds <CZ9YT=RR> <CZ1002471=> on offer on Wednesday at an average yield of 3.143 percent, a drop of 67.5 basis points below the yield in a previous auction in July. There were hardly any foreign bidders however as the Czech Republic had just issued a Eurobond last week.
The asset swap spread was around 70 basis points, traders said.
Poland also sold all 3.0 billion zlotys ($989.1 million) of bonds on offer at its sale. Demand was 8.95 billion zlotys, for a bid-to-cover ratio of 2.98 times.
Yields dropped 35 basis points from a June tender to 5.456 percent, while the demand -- much stronger than the Czech auction after Prague's 2 billion euro Eurobond last week -- helped cut yields on the secondary market.
"The Polish auction obviously ended up much better than the Czech one, where there was a surprisingly low demand as the market appears saturated," said Dalimil Vyskovsky, an interest rate dealer at Komercni Banka.
"In the Czech auction there were practically no foreign bidders, which I think was because they have saturated themselves in the Eurobond sale and skipped this auction."
The Czechs sold 2 billion euros in 10-year Eurobonds on Sept. 6 at a margin of 105 basis points above mid swaps. They twice cut the price guidance thanks to demand hitting more than double the sold amount.
Prague enjoyed favourable financing terms relative to its central and east European peers, thanks to its relatively low debt at around 37 percent of gross domestic product this year and plans to reduce its fiscal deficit to 3 percent of GDP in 2013.
YIELD COMPRESSION
Coinciding with a pick-up in global risk appetite for some sectors, the Czech and Polish bond sales contrast with debt trends elsewhere in Europe, where some governments have struggled to keep yields from rising.
Although safe-haven Germany drew strong demand for its 10-year Bund on Wednesday, Portugal saw yields jump on 12-month treasury bills to 3.369 percent, from 2.756 two weeks earlier.
And while the nine-year Irish spread over Bunds have climbed 121 basis points to 354 since June, the comparable Czech spread has narrowed to 91 basis points, from 178.
Long-term Czech yields hit a record low on Friday, helped by the government's ambitious fiscal consolidation agenda and plans to cut its gross borrowing next year to 250-270 billion crowns from 306 billion crowns under the previous plan.
In Poland, where officials say growth should exceed 3 percent in 2010, dealers said a lower-than-expected inflation reading for August had also helped tame expectations for an early interest rate hike, although markets still expect one by the end of the year.
"I believe further gains on Polish bonds are possible (thanks to) further falls in yields in Germany and the U.S., high market trading volumes, and inflation staying at surprisingly low levels," a Warsaw dealer said.
"Supply plans for next year are also generally lower than we had anticipated," he added.
(Reporting by Jana Mlcochova; Editing by Michael Winfrey and Susan Fenton)