Yield-of-Phosphorus Curves
1954
Dean, L. A.
This paper embraces a study of the curves relating the total phosphorus absorption by plants with the fertilizer phosphorus additions (yield-of-phosphorus curves) and may be summarized as follows: For applications up to 160 pounds P₂O₅ per acre mixed throughout the soil, the “normal” yield-of-phosphorus curve was found to be an ascending straight line. Extrapolation of the yield-of-phosphorus curves to the point of intersection with the X axis gave a measure of the available soil phosphorus which approximated the ‘A’ value. Estimates obtained by extrapolation of yield curves gave values about half has large. The slope of the yield-of-phosphorus curves is to a degree influenced by the phosphate fixation processes.
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