Grain futures mounted the classic turnaround Tuesday overnight, with corn and wheat holding gains as the wheat market is technically finding short covering from a large fund position. After making new lows for the year yesterday and Chicago wheat, index funds are lighting up on their position, which means they have to buy in order to get rid of their short. Soybeans turned lower after rallying higher by $0.16 on the session and are now dealing with more rain coming from Argentina setting up the prospects of further price erosion.