CANADA RULING ON U.S. CORN INJURY DUE THIS WEEK The Canadian government is expected to announce later this week its final ruling whether U.S. corn exports to Canada have injured Ontario corn growers, U.S. government and farm group representatives said. The deadline for a final determination is March 7. U.S. officials said they are encouraged by the outcome in a similar case covering European pasta imports. In that case, Canada decided pasta imports, which take about ten pct of the Canadian market, did not injure domestic producers. U.S. corn exports represent only about five pct of the Canadian market. Canada slapped a 1.05 dlrs per bushel duty on U.S. corn imports in November 1986, but reduced the duty to 85 cts last month because the Canadian government said U.S. subsidies to corn producers were less than Canada earlier estimated.