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Solubility of Phosphorus in Chemical Extractants as Indexes to Available Phosphorus in Ohio Soils¹

ABSTRACT

Eighteen samples of soils were subjected to greenhouse cropping with alfalfa and corn and to various extractant solutions for measurements of soluble P. The P removed from the soils by alfalfa and the "A" values calculated from the uptake by corn of radioactivity tagged superphosphate were used as a measure of plant-available P. The accuracy of estimation of available P by the solubility data was obtained by comparing the P solubility in the various extractant solutions against the plant-available P. The Bray No. 1 solution (0.03 N NH₄F-0.025 N HCl) and the 0.5 M NaHCO₃ solution extracted amounts of P that were accurate estimates of plant-available P. The Bray No. 2 solution (0.03 N NH₄F-0.1 N HCl), 0.002 N H₂SO₄, and citric acid extracted amounts of P that when plotted against the plant data gave a distinctly different relationship for young soils formed from high-lime late Wisconsin till than for older soils formed from more acid parent materials.

¹ Contribution from the Department of Agronomy, Ohio Agr. Exp. Sta., Journal paper number 20–54.

² Former Graduate Assistant and Assistant Professor, respectively, of the Ohio Agr. Exp. Sta. and the Ohio State University. The senior author is now with the Samuel Roberts Noble Foundation, Inc., Ardmore, Okla.

Received for publication March 11, 1954.