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Soil Science Society of America Journal Abstract -

Changes in Bray P-1 Soil Phosphorus Test Values Resulting from Applications of Phosphorus Fertilizer1


This article in SSSAJ

  1. Vol. 35 No. 4, p. 595-598
    Received: Nov 11, 1970
    Accepted: Feb 25, 1971

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  1. T. R. Peck,
  2. L. T. Kurtz and
  3. H. L. S. Tandon2



Increases in soil test values (Bray P-1) resulting from annual applications of P fertilizer were approximately 1 pp2m for each 4 pp2m of P added in fertilizer during a 3-year period on six field experiments. In another field experiment, soil tests were made over a 5-year period following a single fertilizer application, and again the addition of approximately 4 pp2m of fertilizer P was required to increase the P-1 soil test by 1 pp2m. These results also indicated that the soil test values, though still changing, were sufficiently stable to be reliable 1 year after the application. When a more variable group of soils were incubated in the laboratory for 49 weeks, additions ranging from 2 to 10 pp2m of P were required to increase the soil test value by 1 pp2m.

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