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Published in Soil Sci Soc Am J 26:563-566 (1962)
© 1962 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Comparing Measurements of the Effect of Residual Fertilizer Phosphorus in Some Iowa Soils1

Charles M. Smith and John T. Pesek2

ABSTRACT

The accuracy of the chemical soil test (0.03N NH4F in 0.025N HCl) for predicting biological response to residual fertilizer P was determined for several Iowa soils. Significant correlations were obtained with various measurements in the field and greenhouse, including grain, total dry matter, yield of P and radioactively determined A values.

Soil test P was the most highly correlated with greenhouse A values and the relationship was essentially linear over the range of levels of residual P. One regression line described this relationship for all neutral and acid soils tested but was different from that for a calcareous (pH 8.0) soil. The soil test predicted the A values equally well regardless of whether the fertilizer P had been applied 1, 2, or 3 years previously.

NOTES

1 Journal Paper No. J-3834 of the Iowa Agr. and Home Econ. Exp. Sta., Ames. Project 1189. Financial support of the National Plant Food Institute is gratefully acknowledged. Presented, in part, before Div. IV, Soil Science Society of America at Cincinnati, Ohio, Nov., 1956.

2 Former Research Associate (presently Associate Professor, Extension Soil Scientist, Montana State College, Bozeman); and Professor of Soils, respectively. Agronomy Department, Iowa Agr. and Home Econ. Exp. Sta., Ames.

Received for publication July 8, 1960. Accepted for publication May 4, 1962.






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