Corn futures prices traded in less than a 5-cent range before closing fractionally lower. Funds and other noncommercials holding long positions in May corn concentrated on rolling them forward before the first delivery intentions day next Thursday. General Comments Describing dull markets is never very exciting, and grain and soy markets have been quite dull this week. There has been nothing, not even the outbreak of avian flu, to stimulate much buying interest. Generally, prices have moved slowly lower in much the same way as sandpaper grinds down wood, and watching them has been about just as exciting. For the last 11 trading sessions, corn prices have been stuck in a 9-cent trading range. May corn has moved between $3.71-3.80 with dail...