* Soybeans dented by record crop forecast and steady rating
* Corn prices fall after bounce, wheat down for second
session

By Gus Trompiz and Naveen Thukral
       PARIS/SINGAPORE, Aug 13 (Reuters) - Chicago soybeans
lost more ground on Tuesday, setting another four-year low after
government data reinforced the prospect of a bumper U.S.
harvest.
    Corn edged lower, giving up some of Monday's gains as a
better than expected rating of U.S. crops tempered support from
a surprise downward revision to projected U.S. corn stocks.
    Wheat also eased against a backdrop of competition from
cheaper Black Sea supplies and after a modest purchase by Egypt
in a huge import tender.
    In a closely watched supply and demand report on Monday, the
U.S. Department of Agriculture (USDA) raised its estimates for
corn and soybean production from a month earlier, putting its
soybean crop projection at a record level.
    The agency also raised its outlook for soybean stocks,
though it trimmed its corn stocks forecasts as it increased its
projection for exports.
    A separate USDA report issued later in the day kept the
focus on strong harvest prospects as the agency left its weekly
ratings for corn and soybean crop conditions unchanged, contrary
to market expectations of a slight decline.
    "The USDA (supply and demand) report was bearish for
soybeans but quite supportive for corn," commodity data platform
CM Navigator said in a note. 
    "Overnight, the U.S. weekly conditions report confirmed the
positive USDA outlook for US corn and soybean crops."
    The most active soybean contract on the Chicago Board of
Trade (CBOT) was down 1.5% at $9.71-1/4 a bushel by 1025
GMT.
    It earlier fell to $9.68 for its lowest since early
September 2020 and below a previous four-year low set on Monday
when the benchmark breached the $10 price floor.
    CBOT corn gave up 0.5% to $3.99-1/2 a bushel after
rebounding on Monday from a multi-year low below the
psychological $4 threshold.
    CBOT wheat was 1% down at $5.31-1/2 a bushel, falling
for a second session.
    The corn and soybean markets will receive another supply
pointer on Tuesday as Brazilian agency Conab issues monthly crop
forecasts for the major exporter.
    Egypt's state grains buyer said it bought 280,000 metric
tons of wheat in a tender on Monday, falling well short of its
target of 3.8 million tons.
    Even before the purchase was announced, wheat futures had
been pressured by price offers reported by traders, emphasising
the price advantage of Russian and Ukrainian wheat.
    
    
 Prices at 1025 GMT                                    
                            Last       Change  Pct Move
  CBOT wheat              531.50        -5.25     -0.98
  CBOT corn               399.50        -2.00     -0.50
  CBOT soy                971.25       -14.75     -1.50
  Paris wheat             213.00        -1.50     -0.70
  Paris maize             202.75         0.00      0.00
  Paris rapeseed          456.00        -4.00     -0.87
  WTI crude oil            80.04        -0.02     -0.02
  Euro/dlr                  1.09         0.00     -0.08
 Most active contracts - Wheat, corn and soy US
 cents/bushel, Paris futures in euros per metric ton
 
    
    

 (Reporting by Gus Trompiz in Paris and Naveen Thukral in
Singapore
Editing by Sherry Jacob-Phillips, Eileen Soreng and David
Goodman
)