Hedge funds and commodity traders have poured money into the U.S. grain markets of late, pushing up open interest, volume and prices in a sector that had previously seen limited action due to hefty supplies. Pro Farmer’s First Thing Today reports that while the inventory outlook has not changed, a drop in the U.S. dollar index and rise in crude oil futures have brought traders back to the U.S. grain markets. Open interest in soybean futures climbed to an all-time high of 860,000 contracts last Wednesday, a 23 percent surge from the month prior. Also, last Wednesday, trading volume in corn and soybeans hit their highest level ever.