Farmer sentiment weakened again in March as the Purdue University-CME Group Ag Economy Barometer fell 8 points to a reading of 117. Both the Index of Current Conditions and Index of Future Expectations declined 8 points in March leaving the Current Conditions Index at 126 and the Future Expectations Index at 113. Weaker prices for key commodities including wheat, corn, and soybeans from mid-February through …