Test of Two Methods for Measuring a Labile Fraction of Inorganic Phosphorus in Soils
1960
Diest, A. van | Jespersen, H. W. | White, R. F. | Black, C. A.
Measurements of the phosphorus extracted from samples of 70 soils by the 0.03N NH₄F, 0.025N 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 H₂PO₄⁻ and HPO₄⁼ 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.
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