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Changes in Bray P‐1 Soil Phosphorus Test Values Resulting from Applications of Phosphorus Fertilizer
Author(s) -
Peck T. R.,
Kurtz L. T.,
Tandon H. L. S.
Publication year - 1971
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1971.03615995003500040032x
Subject(s) - fertilizer , phosphorus , soil test , environmental science , soil water , zoology , agronomy , mathematics , soil science , chemistry , biology , organic chemistry
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.