USDA ESTIMATES ARGENTINE COARSE GRAIN, WHEAT The U.S. Agriculture Department forecast Argentina's 1986/87 coarse grain crop at 13.99 mln tonnes, vs 15.44 mln tonnes last month. It estimated the 1985/86 crop at 17.06 mln tonnes, vs 17.14 mln last month. USDA forecast Argentina's 1986/87 wheat crop at 9.00 mln tonnes, vs 9.00 mln tonnes last month, while the 1985/86 crop was projected at 8.50 mln tonnes, vs 8.50 mln last month. USDA forecast Argentine 1986/87 coarse grain exports at 6.60 mln tonnes, vs 7.73 mln tonnes last month, and projected 1985/86 exports at 9.43 mln tonnes, vs 9.58 mln last month.