GRAINS-Soy falls to 6-week low on U.S. crop prospects; wheat steadies

* Soybeans lose ground on U.S. crop outlook; corn follows

* Trade monitoring African swine flu in Chinese hog herd

* Dec wheat firms after dip below 200-day moving average

(Updates with closing U.S. prices) CHICAGO, Aug 28 (Reuters) - U.S. soybean futures fell nearly 2 percent on Tuesday, with the benchmark November contract on the Chicago Board of Trade hitting a six-week low on expectations of a bumper U.S. harvest and uncertainty about demand, analysts said. Corn futures followed soybeans lower while CBOT wheat steadied after a six-session slide pushed the December contract to its lowest level in nearly six weeks. CBOT November soy settled down 15 cents at $8.33-1/4 per bushel after dipping to $8.33, its weakest level since hitting a contract low on July 16 at $8.26-1/4. CBOT December corn ended down 5-1/4 cents at $3.56-1/4 a bushel while December soft red winter wheat finished up 3/4 cent at $5.23-1/4. Soy futures tumbled on outlooks for rising U.S. supplies at a time when ongoing trade disputes with top buyer China have clouded export prospects. The Pro Farmer advisory service last week projected 2018 U.S. soybean production at a record 4.683 billion bushels, topping the U.S. Department of Agriculture's forecast for 4.586 billion. Pro Farmer also projected a U.S. corn yield of 177.3 bushels per acre, below the USDA's forecast of 178.4 but still a record high, if realized. "The market is still trading off the large production prospects," said Terry Reilly, senior analyst with Futures International in Chicago. "We need the major importers, other than China, to continue to buy U.S. beans. We have not seen the surge in the European business that maybe people were looking for," Reilly said. Others cited worries that outbreaks of African swine fever in China's hog herd could curb demand for soymeal, a key ingredient in hog feed. Also, Brazilian farmers will begin planting soybeans in a few weeks, and analysts expect an expansion in acres that could boost global supplies. CBOT wheat futures firmed in what appeared to be a short-covering bounce after the December contract dipped below its 200-day moving average and hit $5.18-1/2 per bushel, its lowest level since July 19. The market drew support from news that Russian consultancy IKAR lowered its estimate of Russia's 2018 wheat harvest to 69.6 million tonnes, from 70.8 million previously. The firm left its Russian wheat export estimate unchanged at 32.5 million tonnes.

Meanwhile, reacting to the recent fall in prices, Egypt's main state wheat buyer purchased 350,000 tonnes of wheat in an international tender, including 290,000 tonnes of Russian origin and 60,000 tonnes of Ukrainian wheat.

CBOT settlement prices:

Net Pct Volume Last change change CBOT wheat WZ8 523.25 0.75 0.1 76910 CBOT corn CZ8 356.25 -5.25 -1.5 222065 CBOT soybeans SX8 833.25 -15.00 -1.8 109299 CBOT soymeal SMZ8 304.70 -5.90 -1.9 61320 CBOT soyoil BOZ8 28.58 -0.18 -0.6 48395

NOTE: CBOT December wheat and corn and November soybeans shown in cents per bushel, December soymeal in dollars per short ton and December soyoil in cents per lb.

(Reporting by Julie Ingwersen in Chicago Additional reporting by Naveen Thukral in Singapore and Sybille de La Hamaide in Paris Editing by Richard Chang and Matthew Lewis)