Grain futures mostly lower - UPI.com CHICAGO, May 31 (UPI) -- Grain markets closed mostly lower Thursday on the Chicago Board of Trade as the pro-rated dollar index was flat, gaining just 0.02 percent. Corn was off 4 1/4 to up 1 3/4, soybeans were off 22 1/4 to off 33 1/4, wheat was off 6 1/4 to off 10, oats were off 2 1/4 to up 10. Corn futures were mixed, as the early spring planting has given way to concerns about the lack of rainfall. Wheat prices closed lower with sluggish equity markets suggesting slow demand for commodities. A trend of long liquidation undermined soybean futures Thursday, as did indications of weak short-term demand from China. Corn: Jly 5.55 1/4 off 4 1/4; Sep 5.25 1/2 off 1 1/4; Dec 5.22 up 1 1/2; Mar 5.32 3/4 up 1 3/4. Soybeans: Jly 13.40 off 33 1/4; Aug 13.22 3/4 off 31 3/4; Sep 12.93 3/4 off 27 1/4; Nov 12.70 1/4 off 22 3/4. Wheat: Jly 6.43 3/4 off 10; Sep 6.60 3/4 off 8 1/2; Dec 6.84 1/4 off 7 1/2; Mar 7.04 1/4 off 6 1/4. Oats: Jly 2.80 3/4 up 10; Sep 2.80 3/4 up 6 3/4; Dec 2.81 off 1 1/2; Mar 2.86 1/4 off 2 1/4.