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Published in Soil Sci Soc Am J 24:447-450 (1960)
© 1960 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Forms of Newly Fixed Phosphorus in Three Acid Sandy Soils1

T. L. Yuan, W. K. Robertson and J. R. Neller2

ABSTRACT

Soils were extracted successively with 1N NH4Cl, 0.5N NH4F, 0.1N NaOH and 0.5N H2SO4 solutions to represent water-soluble, aluminum, iron and calcium phosphates, respectively. Over 80% of the added phosphorus was retained by the soils as aluminum and iron phosphates. Less than 10% was in the water-soluble and calcium phosphate forms. The balance not accounted for may have been in forms other than those mentioned.

The ratio of aluminum phosphates to iron phosphates increased with the rates of applied phosphorus for the three soils. This was more evident for Red Bay fine sandy loam and Norfolk loamy fine sand than Leon fine sand.

Increasing soil drying temperature decreased the percentage of phosphorus in the aluminum phosphate form, but increased that in the iron phosphate form. The prolonged alternate wetting and drying reduced the percentage of phosphorus in aluminum form in Red Bay fine sandy loam and Norfolk loamy fine sand, and increased the percentage distribution in iron form in Red Bay fine sandy loam and Leon fine sand.

NOTES

1 Journal Series No. 1011 of Florida Agr. Exp. Sta., Gainesville; presented before Div. II, Soil Science Society of America, Nov. 19, 1959, at Cincinnati, Ohio.

2 Assistant Chemist, Associate Chemist, and Soil Chemist, respectively. The authors are indebted to H. P. Liu for his assistance in P32 assay work, and H. L. Carver and Charles Byron for chemical analyses.

Received for publication November 21, 1959. Accepted for publication June 14, 1960.






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