GRAINS-Soybeans fall 1 pct to three-week low on concerns of U.S. stockpiles rise

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* Soybeans fall on U.S.-China trade war

* Trade war could add to U.S. stockpiles

* Wheat falls 1 pct, corn retreats

SYDNEY, Aug 13 (Reuters) - U.S. soybean futures fell 1 percent on Monday to a three-week low as the market worried a trade dispute between Washington and Beijing would cause U.S. stockpiles, already projected at a record high, to rise even further. Wheat fell 1 percent, shrugging off concerns about lower global output amid unfavorable weather across several major exporters, while corn also retreated. The most active soybean futures on the Chicago Board Of Trade were down 0.9 percent to $8.53-3/4 a bushel by 0451 GMT. The contract earlier fell by as much as 1 percent to $8.53 a bushel, the lowest since July 19. Soybeans slumped 4.7 percent on Friday and are down for a third straight session. Analysts said prices were under pressure amid fears that the trade dispute will cause U.S. soybean stockpiles to rise beyond the record project by the U.S. Department of Agriculture (USDA) because of lack of buying from China, the biggest importer of U.S. beans, because of the trade dispute. "The USDA figures risk being swelled if China continues to shun buying U.S. supplies," said Phin Ziebell, an agribusiness economist at National Australia Bank In its monthly supply and demand report on Friday, the USDA projected a record-large 2018 U.S. soybean crop. U.S. soybean stocks at the end of the 2018/19 season next August were seen swelling to an unprecedented 785 million bushels. Despite remaining under pressure, traders continue to watch the activities of three ships laden with soybeans bound for China. Three shipments have been held of China's coast for more than a month amid uncertainty over whether the buyers were prepared to pay hefty tariffs on U.S. goods. On Saturday, one of the vessel docked in the port of Dalian, hinting Chinese buyers is willing to buy U.S. beans.

The most active corn futures were down 0.8 percent to $3.68-3/4 a bushel, the lowest since July 25. Corn closed 2.9 percent in the previous session. Corn remains under pressure from the USDA's projections for record U.S. yields. The most active wheat futures were down 1 percent at$5.41-1/4 a bushel, having closed down 3.1 percent on Friday.

Grains prices at 0451 GMT

Contract Last Change Pct chg Two-day chg MA 30 RSI CBOT wheat 541.25 -5.50 -1.01% -4.12% 524.02 44 CBOT corn 368.75 -3.00 -0.81% -3.66% 370.64 35 CBOT soy 853.75 -8.00 -0.93% -5.56% 875.27 34 CBOT rice 10.55 $0.00 +0.00% -0.94% $11.69 12 WTI crude 67.54 -$0.09 -0.13% +1.09% $69.81 41

Currencies

Euro/dlr $1.137 -$0.004 -0.34% -1.34% USD/AUD 0.7271 -0.003 -0.41% -1.34%

Most active contracts Wheat, corn and soy US cents/bushel. Rice: USD per hundredweight RSI 14, exponential

(Reporting by Colin Packham; Editing by Christian Schmollinger)