Fertilizer prices have risen about 100 percent in the past year. STRONGSOIL allows farmers to save money by cutting fertilizer use and still maintain yields. Graph: U.S. Bureau of Labor Statistics, Producer Price Index by Commodity: Chemicals and Allied Products: Fertilizer Materials [WPU0652], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/WPU0652, April 21, 2022.