* For full poll data, click on
* July-Sept GDP seen picking up slightly to 4.6 pct y/y
* GDP data to be released on Nov. 29 at 1200 GMT
BANGALORE, Nov 26 (Reuters) - India's economic growth likely picked up slightly in the July-September quarter as improved manufacturing activity steered it from a four-year low in the previous three months, a Reuters poll showed on Tuesday.
Any improvement would be welcome news for the government as a string of opinion polls forecast a poor performance for the ruling party in general elections which must be held by next May.
Economic growth virtually halved in two years to 5 percent in the last fiscal year - the lowest level in a decade - and most economists surveyed by Reuters last month expect 2013/14 to be worse.
The consensus of 40 economists showed gross domestic product expanded 4.6 percent year-on-year in the last quarter, better than the 4.4 percent in the previous three months, which was the lowest since the global financial crisis.
"It is only a marginal improvement with much of the support from a slight recovery in manufacturing sector," said Upasna Bhardwaj, an economist at ING Vysya Bank.
A moderate recovery in Indian factories and exports were probably the main drivers for an increase in overall growth in the quarter through September. Annual industrial output picked up 2 percent in September, driven by an uptick in export and domestic orders.
Stronger global demand for India's exports also led to an increase in production, with exports growing 11.15 percent annually in September.
Also, a good monsoon should have boosted rural income and perked up flagging consumer demand.
However, a dearth of investment lies at the heart of India's economic malaise.
Little improvement is expected ahead of the general election, with investors doubting whether Prime Minister Manmohan Singh's minority government can force through any bold actions between now and then.
Radhika Rao, an economist at DBS in Singapore, said euphoria surrounding Singh's earlier reform plans had eased after they failed to materialise.
"It is not surprising that the private sector keeps expansion plans on ice," Rao added.
With wholesale price inflation moving back above the Reserve Bank of India's perceived comfort level of 5 percent and consumer inflation quickening to more than 10 percent, there is little expectation the central bank will act to ease policy boost growth.
In face, new RBI chief Raghuram Rajan has hiked interest rates twice in as many months since September, tackling rising prices head on.
(Polling and analysis by Sarbani Haldar; Editing by Kim Coghill)