-Cash basis has picked up about 5-7 cents for old-crop corn at central Illinois grain elevator
--Producers are not encouraged to sell at prices below what they saw a couple of weeks ago
--Farmers are turning their attention to planting, losing interest in marketing supplies
CHICAGO (MarketWatch)-Farmers have tightened their grip on stored U.S. corn inventories once again, taking a bullish stance after government forecasters last week reported available corn supplies were smaller than expected. Farmers are reluctant sellers of inventories, unwilling to part with supplies amid the uncertainties ahead of a summer weather market, in a year where large U.S. production is needed to rebuild depleted inventories.