St. Joseph News Press: Mike Easter a contractor for MFA Agri Services sprays herbicide on a farm south of St. Joseph. MFA manager Jim Veraguth says farmers have to calculate the cost of energy compared to the price their crops will bring. Farmers plant a crop, but they hope to reap a balance. With energy concerns, Jim Veraguth believes, that becomes tricky. Mr. Veraguth manages MFA Agri Services in St. Joseph and sees farmers in constant calculation on the fluctuating demand for corn to make ethanol …