DeWitt to lead Leopold Center three more years ; Cover crops in the Corn Belt: Survey finds underused potential as conservation tool ; Director column: How would you frame the priority issues for the Leopold Center? ; Kirschenmann column: It's all about market power, stupid ; Leopold Center coordinates statewide project ; Web-based tool expands use for biomass crops ; Northeast Iowa group hopes to build stronger food economy ; Practical Farmers of Iowa toasts Leopold Center ; Food miles become media metaphor