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Phosphorus Uptake and Soil Tests as Related to Forms of Phosphorus in Some Michigan Soils¹

ABSTRACT

Truog P, Bray P, Olsen P, resin P, and surface P were all determined on samples of 17 surface soils from Michigan (from 5 great soil groups), and each soil was cropped in the greenhouse with barley for 4 weeks to determine P uptake and A values. Ca-P, Al-P, Fe-P (by the Chang and Jackson procedure), and organic P were determined on 10 of these soils.

Correlation analyses indicate that short-term uptake of P by barley in the greenhouse was highly correlated with Truog P, while A values, which may be more indicative of seasonal availability, were most highly correlated with Olsen, resin, and Bray P. Organic P and Fe-P did not contribute to the P removed by any of the measurements. Truog P apparently removed portions of both the Ca-P and Al-P fractions, and P removed by cropping was also derived from these two fractions. All the other measurements were highly correlated with only Al-P.

¹ Authorized for publication by the Director of the Michigan Agr. Exp. Sta., Michigan State University, E. Lansing, as Journal Article No. 3023. Presented before Div. IV, Soil Science Society of America, Ithaca, New York, Aug., 1962.

² Visiting Professor, Professor, and Associate Professor of Soil Science, respectively. The senior author wishes to express his appreciation for his appointment as Fellow by the Rockefeller Foundation.

Received for publication September 12, 1962. Accepted for publication March 22, 1963.