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(Updates prices) * China books new purchases of U.S. soy * Corn falls on fresh DDG rejections by China * Wheat drops 2 percent as global supply expectations rise By Mark Weinraub CHICAGO, Jan 15 (Reuters) - U.S. soybean futures rose for the fifth day in a row on Wednesday due to strong demand from exporters as well as domestic processors, traders said. Wheat futures crumbled, dropping 2 percent, as huge global supplies weighed on the market. Corn also was weaker, with fresh Chinese rejections of distillers' dried grains roiling export prospects for U.S. supplies, traders said. The U.S. Agriculture Department on Wednesday morning said private exporters reported the sale of 106,000 tonnes of U.S. soybeans to China for the 2014/15 marketing year.A weekly USDA report on Thursday morning was expected to show export sales of soybeans in a range from 750,000 to 1.05 million tonnes, up from 156,200 tonnes a week ago. "We are just continuing to see the demand leading the soy complex higher," said Karl Setzer, analyst at MaxYield Cooperative in West Bend, Iowa. "Soybeans are taking the majority of their support today off simple demand coming out of the Asian market." The monthly crush report from the U.S. National Oilseed Processors Association showed that domestic demand for the oilseed remained strong amid good profit margins. NOPA said that U.S. processors crushed a record 165.384 million bushels of soybeans in December, topping market forecasts. Chicago Board of Trade March soybeans closed up 11 cents at $13.18 a bushel. The contract has risen 3.8 percent during its five-session winning streak, the longest for the benchmark contract since a six-day stretch ended Nov. 13, 2013. New-crop soybean contracts weakened despite the gain in the nearby futures, weighed down by expectations of large crops from South America and the United States in the coming year. The old-crop/new-crop spread widened to more than $2 for the first time this year even amid concerns about dry and hot weather in Argentina potentially curtailing crop production. CBOT corn futures for March delivery settled down 5-3/4 cents at $4.25-3/4 a bushel. A weak cash market contributed to the decline, as processors and ethanol plants lowered their basis bids following good farmer sales in recent days. "The corn rally which started on Friday seems to have run out of steam with the rising prices generating selling among those holding inventories," said Saxo Bank analyst Ole Hansen. "The outlook for corn demand is also dimming, with China rejecting U.S. cargoes in the dispute about genetically-modified shipments at a time of high corn inventories." Chinese quarantine authorities have rejected more cargoes of distillers' dried grains (DDGs), a corn by-product from the United States, due to the presence of an unapproved genetically-modified (GMO) strain, traders said on Wednesday. The size of the rejections was unknown. CBOT March soft red winter wheat ended down 11-1/2 cents at $5.67-3/4 a bushel, ending near session lows. Traders said the market was technically weak, closing below the low end of its 20-day Bollinger range. Ukraine boosted its 2013 grain harvest estimate by 36 percent to a record high. Estimate includes 22.278 million tonnes of wheat, up from 15.762 million in 2012. India's 2014 wheat production was seen at more than 100 million tonnes, a new record, according to Farm Minister Sharad Pawar. Prices at 1:48 p.m. CST (1948 GMT) LAST NET PCT YTD CHG CHG CHG CBOT corn 425.75 -5.75 -1.3% 0.9% CBOT soy 1318.00 11.00 0.8% 0.4% CBOT meal 434.50 4.40 1.0% -0.7% CBOT soyoil 37.99 0.23 0.6% -2.1% CBOT wheat 567.75 -11.50 -2.0% -6.2% CBOT rice 1564.00 16.00 1.0% 0.8% EU wheat 192.75 -2.25 -1.2% -7.8% US crude 94.29 1.70 1.8% -4.2% Dow Jones 16,495 121 0.7% -0.5% Gold 1238.51 -6.20 -0.5% 2.8% Euro/dollar 1.3602 -0.0077 -0.6% -0.4% Dollar Index 81.0170 0.3550 0.4% 1.2% Baltic Freight 1374 4 0.3% -39.7% In U.S. cents, benchmark contracts, except EU wheat (euros) and soymeal (dollars). CBOT wheat, corn and soybeans per bushel, rice per hundredweight, soymeal per ton and soyoil per lb. (Editing by Sophie Hares and Meredith Mazzilli) ((mark.weinraub@thomsonreuters.com)(+1 312 408 8587)(Reuters Messaging: mark.weinraub.thomsonreuters.com@reuters.net)) Keywords: MARKETS GRAINS/