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Determination of Organic Phosphorus in Soils: II. Ignition Method¹

ABSTRACT

A procedure was developed in which comparable samples of soil are extracted by concentrated HCl before and after ignition for 1 hour at 240°C. The difference in content of inorganic phosphorus in the extracts before and after ignition may be taken directly as an estimate of the content of organic phosphorus in the soil. Analysis of a number of samples by the ignition procedure and an extraction procedure developed previously, however, showed a small systematic deviation of results obtained by the former method from results obtained by the latter. An empirical regression equation was calculated for use in predicting the content of organic phosphorus by the extraction procedure from the content of organic phosphorus by the ignition procedure.

¹ Soil Phosphorus Research Project of the North Central Region. Contribution from the Section of Soil and Plant Relationships, S.W.C.R.B., A.R.S., U.S.D.A. and the Iowa Agr. Exp. Sta. Journal Paper No. J-2543 of the Iowa Agr. Exp. Sta., Ames, Iowa. Project No. 1183. The authors are indebted to Prof. O. Kempthorne and Mr. R. F. White for assistance in the statistical phases of the work. Presented before Div. II, Soil Science Society of America, St. Paul, Minn., Nov. 9, 1954.

² Soil Scientist, U.S.D.A., and Professor of Soils, respectively.

Received for publication August 25, 1954.