* German first-half budget surplus 16.1 billion euros
* Weak investment, slow trade shrink German GDP
* Pressure rises for Germany to boost investment spending (Adds Schaeuble comments)
By Michelle Martin and Noah Barkin
BERLIN, Sept 1 Germany posted its biggest budget surplus since reunification in the first half of 2014, underscoring the strength of its finances just as it encounters growing pressure to spend more to bolster growth in Europe.
The budget figures came as a detailed breakdown of German gross domestic product (GDP) data showed a sharp decline in capital investments contributed to a 0.2 percent contraction in the second quarter, further ammunition for advocates of spending.
"In other European countries the figures will give confirmation to those who expect more fiscal policy impetus from Germany," said Holger Sandte, an economist at Nordea Bank.
Partners like France and Italy have been urging Germany to allow greater fiscal leeway in Europe and take steps at home, such as cutting taxes and boosting public investment, to jump-start the euro zone, which stalled in the second quarter.
Last month, European Central Bank President Mario Draghi appeared to back those calls, breaking with his traditional support of German-led budget consolidation, and stressing the need for greater fiscal stimulus.
German Finance Minister Wolfgang Schaeuble has played down Draghi's remarks as "overinterpreted". German weekly Der Spiegel reported at the weekend that he and Chancellor Angela Merkel had called Draghi to complain about the speech, though a government spokesman denied the chancellor had done so.
On Monday, Merkel left the door open to channeling the budget surplus into investment programmes, but said this could happen only if the economy is strong enough.
Schaeuble acknowledged later at a Berlin conference that there was too little investment in Europe but voiced scepticism that this should be fixed by public spending or loose monetary policy.
In addition to weak investment spending, the economy is suffering from weak euro zone demand for German exports, sinking business confidence in the face of the Ukraine crisis and worries about the impact of Merkel's shift out of nuclear power.
Some economists believe Germany could suffer another quarter of contraction in July-September, technically putting it in a recession.
Data showed on Monday that Germany's overall budget surplus - grouping federal, state and local governments and the social security system - amounted to 16.1 billion euros ($21.2 billion) or 1.1 percent of GDP in the first half the year.
That is the strongest fiscal position since reunification in 1990 and puts Germany on track to a achieve a surplus in 2014 for a third straight year. It is the only euro zone state where the European Commission sees a surplus this year.
"The budget figures reflect the good domestic economy and the rise in employment and consumption," Nordea's Sandte said.
In his late-August speech at a central bankers' conference in Jackson Hole, Draghi said it would be "helpful for the overall stance of policy" if fiscal policy could play a greater role alongside the ECB's monetary policy. His suggestions included implementing an EU-wide public investment programme.
Some economists believe Germany is suffering from an investment crisis that will take the shine off an economy held up as a model of dynamism during the euro zone's debt crisis.
Total annual investment levels in Germany amount to around 17 percent of GDP - below those of other industrialised countries, which average over 21 percent.
The detailed breakdown of GDP data showed gross capital investment in Germany slid by 2.3 percent and construction investment fell 4.2 percent in the second quarter. This drop was partly due to a mild winter which boosted building activity in the first quarter.
Foreign trade, traditionally the driver of German growth, subtracted 0.2 percentage points from growth while private consumption and inventories made a positive contribution.
Other data also pointed to a slowdown. Germany's manufacturing sector expanded at its slowest rate in 11 months in August and figures from the VDMA engineering association showed orders stagnated in July as demand at home dropped. (1 US dollar = 0.7614 euro) (Reporting by Michelle Martin, Noah Barkin and Annika Breidthardt; Editing by Ruth Pitchford)
MIDEAST STOCKS - Factors to watch - Mar 26
DUBAI, March 26 Here are some factors that may affect Middle East stock markets on Sunday. Reuters has not verified the press reports and does not vouch for their accuracy.