April 11 (Reuters) - Chicago Board of Trade corn futures were expected to open 1 to 2 cents per bushel higher on Wednesday on a weak dollar, firm crude oil and a rebound in equities. * Globex overnight trend for corn was up 1-3/4 cents to up 2-1/2 cents per bushel. * Investment bank Goldman Sachs said it was maintaining its outlook for higher old-crop corn and new-crop soybeans in response to the USDA's April supply/demand report on Tuesday. Three-month price target on old-crop corn $6.90 per bushel and three, six and 12-month price forecasts for CBOT soybean futures at $14.30. * Freezing temperatures early on Wednesday covered most of the Midwest and some damage may have occurred to emerging corn and jointing wheat in portions of central Illinois, central and southeastern Indiana, southwestern Ohio and a few spots in Kentucky, according to Commodity Weather Group. Temperatures fell as low as 28 (degrees Fahrenheit). * Jason Nicholls, meteorologist for AccuWeather said another bout of cold weather was expected early Thursday followed by warmer temperatures and rainfall then there is the potential for another freeze next week. "There could be another frost or freeze at mid-week but the weather models differ on that this morning," Nicholls said. * Corn spot basis bids were firm at river terminals around the U.S. Midwest late on Tuesday and mostly steady at interior markets, supported from plunging futures and the continued light country offerings, grain merchants said. * The July/December was at 82-1/2 cents, premium July and the December corn/November soybean ratio was at 2.51. * Key support for May at its 100-day moving average of $6.35 and resistance at the 50-day ma of $6.46-1/2. The nine-day RSI was at 45. 8:03 AM CDT LAST NET PCT LOW HIGH CURRENT CHNG CHNG VOL Corn MAY 637.25 2.5 0.4 632.00 639.75 14,765 Corn JUL 628.00 2.25 0.4 622.75 630.00 12,225 Dalian SEP 2432.00 -13 -0.5 2429.00 2439.00 227,966 OVERNIGHT VOLUME 30-D ATM VOLATILITY CURRENT 30D AVG 250D AVG CURRENT CHG CBOT CORN 33,519 23,708 25,978 27.9 -2.3 TOTAL MARKET DALIAN CORN 284,002 492,299 218,736 (Reporting By Sam Nelson;editing by Sofina Mirza-Reid)

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