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This article in SSSAJ

  1. Vol. 35 No. 4, p. 595-598
     
    Received: Nov 11, 1970
    Published: July, 1971


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doi:10.2136/sssaj1971.03615995003500040032x

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

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

Abstract

Abstract

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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