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The Method of Mehta et al. Modified for Determination of Organic Phosphorus in Soils High in Extractable Iron¹

ABSTRACT

A modification is proposed for the Mehta et al. organic phosphorus determination for soils high in free iron where a strong interference by the dissolved iron occurs in the colorimetric determination of total and inorganic phosphorus. This interference can be eliminated by passing the extracts through a strong acid cation exchange resin which removes the interfering ions.

Key Words: tropical soils

¹ Inter-American Institute of Agricultural Sciences, Turrialba, Costa Rica. This study was supported by the U. S. Atomic Energy Commission under Contract AT(30-1)12043.

² Associate Soil Chemist, Graduate Assistant, and Assistant Soil Chemist, respectively. The second author is currently Professor of Soil Science, Universidade do Para, Brasil.

Received for publication March 24, 1967. Accepted for publication May 3, 1967.