Sens. Chuck Grassley and Joni Ernst from Iowa are leading a bipartisan push to shed light on market factors driving the soaring cost of fertilizer in recent years and encourage more competition. The Fertilizer Research Act, co-sponsored by Grassley, Ernst and Tammy Baldwin (D-Wis.), would require the U.S. Department of Agriculture (USDA) to conduct a study on competition and trends in the fertilizer market...