Corn futures continued to creep up with a few cents higher or so Wednesday morning. Slow farmer selling was resulting in firmer basis as the cold weather spurs domestic feed demand. At the same time demand from ethanol plants is rising as well. But export demand is still sluggish. News out of China said the country is planning to build more containers to reduce storage pressure due to increasing stockpiles of grains. December corn futures advanced 2.75 cent to close at $3.77/bushel Wednesday, while May was up 2.75 cents to $3.985.