(Recasts, updates prices, adds quotes, changes byline, previously HAMBURG) CHICAGO, Jan 22 (Reuters) - U.S. soybean and corn futures fell on Tuesday to session lows on reports that the Trump administration turned down Chinese offers this week for preparatory trade talks, brokers said. The declines in corn and soybeans also pared advances in wheat futures, which had drawn early support from rising Russian cash prices. As of 12:48 p.m. CST (1848 GMT), Chicago Board of Trade March soybean futures were down 9-3/4 cents at $9.07 a bushel after dipping to $8.99-1/2, breaking below chart support at the contract's 50-day moving average near $9.06. CBOT March corn was down 3-1/4 cents at $3.78-1/2 a bushel. March wheat was up 3 cents at $5.20-3/4 a bushel, after reaching $5.26, a one-month high. Soybeans and corn tumbled after the Financial Times reported that the Trump administration rejected an offer from China for preparatory trade talks this week ahead of high-level meetings next week. Losses in U.S. equity markets deepened and the dollar weakened against the Japanese yen after the FT report, on concern the trade war between the world's two biggest economies will continue and ultimately harm the global economy. CBOT wheat clung to modest advances, firming after briefly dipping lower following the slide in soybeans and corn. "Wheat remains positive as Black Sea supplies tighten amid talk of managing shipments, and amid rumors of Chinese interest in 3 to 7 million metric tons of U.S. wheat," INTL FCStone chief commodities economist Arlan Suderman wrote in a client note. Rumors of such large-scale purchases by China have swirled in markets in the past week, but official confirmation is unavailable because of the partial U.S. government shutdown, which has affected the U.S. Agriculture Department. Several reports about possible Black Sea export curbs have appeared. Stronger controls on grain exports are being considered by Russia's state agriculture watchdog. Ukraine's agriculture ministry urged exporters to comply with export limitation memorandum terms as most of the agreed volume of wheat for the 2018/19 season traders has already been shipped.
CBOT prices as of 12:47 p.m. CST (1847 GMT):
Net Pct Volume
Last change change
CBOT wheat WH9 520.50 2.75 0.5 67165 CBOT corn CH9 378.50 -3.25 -0.9 170756 CBOT soybeans SH9 907.00 -9.75 -1.1 100460 CBOT soymeal SMH9 312.20 -2.90 -0.9 44521 CBOT soyoil BOH9 29.00 -0.01 0.0 46075
NOTE: CBOT March wheat, corn and soybeans shown in cents per bushel, March soymeal in dollars per short ton and March soyoil in cents per lb.
(Additional reporting by Michael Hogan in Hamburg, Naveen Thukral in Singapore and Mark Potter)