SINGAPORE, Sept 25 (Reuters) - Chicago soybean futures

slid for the first time in three sessions on Wednesday, as an

outlook for much-needed rains in Brazil eased worries about dry

weather delaying planting in the world's biggest exporter of the

oilseed.

Wheat and corn prices fell.

FUNDAMENTALS

* The most-active soybean contract on the Chicago Board of

Trade (CBOT) lost 0.3% to $10.38-3/4 a bushel as of 0013

GMT, having risen on Tuesday to $10.58, its highest level since

July 25.

* Wheat lost 0.4% to $5.76 a bushel and corn

gave up 0.4% to $4.10 a bushel.

* The soybean market rallied on Tuesday after the central

bank of China, the world's top soybean buyer, announced broad

monetary stimulus and property market support measures to revive

its economy.

* However, prices are coming under pressure as forecast

models predict much-needed rains in Brazil next week that could

bolster soybean planting and crop prospects.

* The U.S. corn and soybean harvest is progressing although

rains crossed the central Midwest on Tuesday, interrupting

fieldwork in some areas.

* In a weekly report released after Monday's market close,

the USDA pegged the soybean harvest as 13% complete and the corn

harvest as 14% done, both ahead of their respective five-year

averages.

* In Argentina, grains and oilseed output could reach up to

143 million metric tons in the 2024/25 season under normal

weather conditions, which could boost exports to their highest

volume in four years, the Rosario grains exchange said on

Tuesday.

* Agricultural markets are awaiting quarterly U.S. grain

stocks report on Monday by the U.S. Department of Agriculture.

* The average estimate for Sept. 1 corn stocks, at 1.844

billion bushels, would represent a four-year high, up 35.6% from

a year earlier. For soybeans, the average estimate of 351

million bushels would also be a four-year high, up 32.9% from

the prior year.

* Workers at the six main grain terminals located in the

Canadian port of Vancouver went on strike on Tuesday, a move

that could disrupt exports of canola and other crops, government

and industry officials said.

* Commodity funds were net buyers of CBOT soybean and soyoil

futures contracts on Tuesday and net sellers of corn, wheat and

soymeal futures, traders said.

MARKET NEWS

* A widely followed global stock index rose to a record

high and copper prices hit their strongest level in 10 weeks on

Tuesday after China unveiled stimulus measures to support its

economy.

DATA/EVENTS (GMT)

0500 Japan Chain Store Sales YY Aug

1000 France Unemp Class-A SA Aug

1400 US New Home Sales-Units Aug