Illinois Fertilizer Conference Proceedings January 25-27, 1999 Home 1999 Index Search

Figure 5. Relationships between soil-test P values (Bray-P₁) and annual
net returns to investments on three annual P rates at various grain prices.

The actual prices were annual averages for the United States from 1976 to 1989.
Higher prices were the prices for each year increased by 50%, and lower prices were
the prices for each year reduced by 50% (adapted from Webb et al. 1992).

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Department of Crop Sciences University of Illinois Extension College of Agricultural, Consumer, and Environmental Sciences University of Illinois at Urbana-Champaign Illinois Fertilizer & Chemical Association Illinois Department of Agriculture

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