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Test of Two Methods for Measuring a Labile Fraction of Inorganic Phosphorus in Soils
Author(s) -
Van Diest A.,
Jespersen H. W.,
White R. F.,
Black C. A.
Publication year - 1960
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/sssaj1960.03615995002400060024x
Subject(s) - phosphorus , soil water , chemistry , fraction (chemistry) , linear regression , alkali soil , yield (engineering) , environmental chemistry , mineralogy , soil science , environmental science , mathematics , materials science , chromatography , metallurgy , organic chemistry , statistics
Measurements of the phosphorus extracted from samples of 70 soils by the 0.03 N NH 4 F, 0.025 N HCl method of Bray and Kurtz and the anion‐exchange resin method of Amer and co‐workers were used as the basis for predicting the yields of phosphorus in plants grown on the soils in the greenhouse. The latter method gave the more precise prediction, but the regression coefficient was smaller for alkaline soils than for acid soils. No distinction between acid and alkaline soils was necessary where the regression of the yield of phosphorus was calculated on the H 2 PO 4 ‐ and HPO 4 = taken up from the soils by the resin. The closest agreement between observed and calculated yields of phosphorus in the test plants was obtained with an equation based on the kinetics of phosphorus absorption by plants.