Corn futures near four-year low, wheat rises

* Traders positioning for Monday's USDA report

* Corn, soy on track for weekly losses

* USDA reports soy sold to China, unknown destinations

CHICAGO, Aug 9 (Reuters) - Chicago corn futures neared four-year lows on Friday while wheat prices rose on expectations of a poor crop in France as traders positioned for Monday's U.S. supply and demand report.

A survey of analysts forecast slightly higher U.S. corn production in the U.S. Department of Agriculture (USDA) report, which would add to large global supplies of the grain.

The most-active corn contract on the Chicago Board of Trade (CBOT) fell 0.19% to $3.96-1/2 a bushel by 1600 GMT after earlier equalling a near four-year low of $3.95 first set last week. Corn was on track for a weekly loss.

Soybeans were down 0.1% at $10.06-1/4 a bushel in choppy trading. The oilseed initially gained after the USDA reported export sales and as an oilseed industry strike in Argentina delayed ships loading in the major soymeal exporter.

The USDA on Friday announced exporters sold 132,000 metric tons of soybeans to China for 2024/2025 delivery, according to its daily reporting system. Exporters also sold 212,000 metric tons to unknown destinations. Soybeans were on track for a weekly loss.

Wheat rose 1.4% to $5.45 a bushel and was on track to gain for the week, boosted by declining crop conditions in France while the market was also awaiting major importer Egypt's largest ever tender on Monday.

France's farm ministry on Friday lowered its estimate of the country's 2024 soft wheat output, now expected to be 25% below last year's volume.

A survey of analysts for the Monday USDA report had an average forecast for U.S. corn production of 15.112 billion bushels, marginally up from the USDA's July forecast of 15.100 billion with higher expected yields offsetting an expected drop in planted area.

"We look for a reduction in U.S. corn planted and harvested area following inclement conditions across the Northwest Midwest in June," J.P. Morgan said in a weekly update on Friday, adding it had upwardly revised its corn yield forecast. (Reporting by Nigel Hunt in London, Bernadette Christina in Jakarta and Caroline Stauffer in Chicago; Editing by Rashmi Aich, Sharon Singleton and Jonathan Oatis)