The Purdue University-CME Group Ag Economy Barometer Index hit 126 points, up from 113 points in June, as corn and soybean prices increased. Corn, however, remained below breakeven while soybean prices were approaching that mark in early August (. That’s understandable given tight margins, with historically high costs and lower commodity prices, he added, in an online analysis. Farmer sentiment rises with grain pricesFarmer sentiment jumped in July, ending three straight months of declines, as corn and soybean prices increased. The Purdue ag barometer hit 126 points, up from 113 points in June.