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This article in SSSAJ

  1. Vol. 29 No. 4, p. 421-423
    Received: Nov 14, 1964
    Accepted: Mar 18, 1965

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Forms of Phosphorus in Soil After Long-Continued Fertilization1

  1. P. B. Manning and
  2. M. Salomon2



The forms of P in a Bridgehampton silt loam (Brown Podzolic) after more than 65 years of phosphate fertilization were studied by the fractionation methods of Chang and Jackson. The investigation showed that superphosphate treatments increased the aluminum phosphate fractions, and iron and calcium phosphate to a lesser degree. Rock phosphate treatments increased the calcium phosphate fraction. Of particular interest was a manured soil where phosphate followed a similar aluminum bonding as did superphosphate.

Occluded and organic phosphate fractions were not greatly affected by various levels and sources of applied phosphate. Summation of the extracted inorganic and organic forms did not equal the total P. This “unextractable” fraction is believed to be tightly bound forms not solubilized by the acid extractions or possibly held as nonexchangeable “lattice” phosphate. There was some indication that lime treatments decreased the amount of aluminum phosphate formed.

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