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Yield-of-Phosphorus Curves¹

ABSTRACT

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.

Contribution from the Soil and Plant Relationships Section, Soil and Water Conservation Research Branch, Agricultural Research Service, U. S. Dept. of Agriculture, Beltsville, Md. This investigation was supported in part by the U. S. Atomic Energy Commission.

² Principal Soil Scientist. The author wishes to express his appreciation to Maurice Fried, W. H. Armiger and R. E. Shapiro for making available unpublished data from greenhouse experiments they conducted.

Received for publication March 1, 1954.