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This article in SSSAJ

  1. Vol. 36 No. 4, p. 664-666
     
    Received: Oct 20, 1971
    Published: July, 1972


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doi:10.2136/sssaj1972.03615995003600040044x

The Relationship of Red Pine Site Index to Soil Phosphorus Extracted by Several Methods1

  1. David H. Alban2

Abstract

Abstract

Phosphorus was extracted by 10 methods from soils in Minnesota supporting stands of red pine (Pinus resinosa Ait.) to find those methods most suitable for estimating site index. The amount of phosphorus extracted from the surface 25 cm of mineral soil by H2O, 0.002N H2SO4, or 0.01N HCl was related at the 1% level (r2 = .47 to .53) to site index. Considerably weaker relationships with site index were obtained with organic P, total P, and phosphorus extracted by 0.5N NaHCO3, 0.4N HCl, 0.025N HCl + 0.03N NH4F, 0.10N HCl + 0.03N NH4F, or 0.05N HCl + 0.025N H2SO4. No improvement in the estimation of site index was made by including phosphorus extracted from deeper layers of the soil. Foliar phosphorus concentration was significantly related to site index and to the amount of phosphorus extracted from the surface soil by H2O, 0.002N H2SO4, or 0.01N HCl.

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