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Effect of Added Phosphate on the Inorganic Phosphorus Fractions of Soils Derived from Volcanic Ash¹

ABSTRACT

Changes in native and applied phosphate in volcanic-ashderived soils of southern Chile were investigated. NH₄Cl-, NH₄F-, NaOH-, and H₂SO₄-extractable P were determined both before and after addition and incubation of these soils with 0, 90, 180, and 270 ppm of P. An anion exchange resin method for extracting P from the soil was also used to study relative P availability.

Initially most of the added P was recovered in the NH₄F-extractable fraction. In the course of time a shift to the NaOH-extractable fraction occurred. The H₂SO₄-extractable fraction did not change with rate of P application or time of equilibration. The anion exchange resin was able initially to extract large amounts of the added P, but the quantities extracted diminished markedly with increased time of incubation. The changes that occurred followed a pattern peculiar to each soil.

¹ Contribution from the Department of Analytical Chemistry, Facultad de Quimica y Farmacia, Universidad de Chile, Santiago, Chile. The authors wish to express their appreciation to Dr. E. Polle for his helpful criticism of the manuscript, and to R. González, C. Bernardi, M. A. Sadzawka, and A. Carrasco for their help in performing some of the experimental work.

² Assistant Professor and Professor of Analytical Chemistry, respectively.

Received for publication February 5, 1970. Accepted for publication March 23, 1970.