(New throughout; updates prices, adds quotes, changes byline, changes dateline from previous PARIS/SINGAPORE) CHICAGO, Sept 21 (Reuters) - Chicago wheat futures eked out a one-month high Thursday on technically driven trade while U.S. soybean and corn futures were little changed as traders waited for the harvest to expand in the Midwest. As of 11:43 a.m. CDT (1643 GMT), Chicago Board of Trade December what was up 3-1/4 cents at $4.53 per bushel after reaching $4.53-3/4, its highest since Aug. 16. CBOT November soybeans were up 1-3/4 cents at $9.71-3/4 a bushel and December corn was flat at $3.50 a bushel. Benchmark December CBOT wheat struggled to climb much above $4.50 a bushel this week, anchored by plentiful global supplies, including a record-large Russian harvest. However, excessive rains in Argentina have threatened wheat yield prospects, while Australia's crop has suffered from persistent dryness in the east. Commodity funds hold a large net short position in CBOT wheat futures, leaving the market vulnerable to bouts of short-covering. Traders were mindful of a U.S. Department of Agriculture Sept. 29 small grains report, in which the government will update its estimates of the U.S. 2017 wheat harvest. "It is likely that USDA finally adjusts their harvested acreage number for spring wheat. We know there was a very significant amount of abandonment because of drought," said Joe Vaclavik, president of Standard Grain, a Chicago brokerage. December spring wheat futures on the Minneapolis Grain Exchange December were up 5 cents at $6.26-1/2 per bushel, rebounding a day after posting a three-month low at $6.14-1/2. Spot MGEX futures had soared above $8 a bushel in early July on worries about scorching heat and drought in the northern U.S. Plains crop belt, but have declined sharply since then. CBOT soybean futures firmed, supported by a larger-than-expected weekly export sales tally. The USDA reported export sales of U.S. soybeans in the latest week at more than 2.3 million tonnes, topping a range of trade estimates for 1.2 million to 1.5 million. Also, through its daily reporting system, the USDA said private exporters sold 132,000 tonnes of U.S. soybeans to China.
However, the pace of U.S. soybean sales is still slower than a year ago. "USDA has set the bar very high for new-crop exports. We've got to continue to see this sort of demand, if we are going to hit that USDA export target," Vaclavik said.
CBOT prices as of 11:42 a.m. CDT (1642 GMT):
Net Pct Volume
Last change change
CBOT wheat WZ7 453.25 3.50 0.8 44430 CBOT corn CZ7 350.00 0.00 0.0 57078 CBOT soybeans SX7 972.00 2.00 0.2 83017 CBOT soymeal SMZ7 312.50 2.40 0.8 24783 CBOT soyoil BOZ7 34.46 -0.45 -1.3 43644
NOTE: CBOT December wheat, December corn and November soybeans shown in cents per bushel, December soymeal in dollars per short ton and December soyoil in cents per lb.
(Additional reporting by Naveen Thukral in Singapore and Gus Trompiz in Paris; Editing by Bernadette Baum)