Abstract
Abstract Measurements of equilibrium phosphate (P) potentials were used to estimate the residual effect of P fertilizer on soil samples taken in the fall from a fertility experiment. After the harvest of spring wheat (Triticum aestivum L.) samples taken over the fertilizer band showed lower P potentials (higher P activity) than samples taken from the unfertilized soil or from areas 6.25 cm away from the fertilizer band. The reduction of equilibrium P potential was proportional to the amount of P applied in the spring for rates up to 17.4 kg P/ha with no further changes when 26.1 kg P/ha was applied. Solubility diagrams for this soil indicated that, at the rates of P fertilization used in this study, the increase in soil P was controlled by sorption processes, and that only at rates more than twice the highest one used would the precipitation of Ca‐P compounds control the concentration of P in solution.
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