Changes in Bray P-1 Soil Phosphorus Test Values Resulting from Applications of Phosphorus Fertilizer1
- T. R. Peck,
- L. T. Kurtz and
- 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.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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