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a States growing corn, b total N fertilizer used on corn over time (squares) and amount per ha (circles); c total P fertilizer used on corn (squares) and amount per ha (circles), d yield of corn per hectare; e–h comparable relationships for soybean. Data are from https://www.ers.usda.gov/data-products/fertilizer-use-and-price. Symbols used are from Vectorstock used under an expanded license
