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Soil Phosphorus Extracted By Iron‐Aluminum‐Oxide‐Impregnated Filter Paper
Author(s) -
Sharpley Andrew N.
Publication year - 1991
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/sssaj1991.03615995005500040025x
Subject(s) - soil water , weathering , filter paper , strips , usda soil taxonomy , calcareous , extraction (chemistry) , aluminum oxide , calcareous soils , soil test , chemistry , phosphorus , oxide , soil science , aluminium , mineralogy , environmental chemistry , geology , materials science , soil classification , geochemistry , composite material , chromatography , paleontology , organic chemistry
The use of Fe‐Al‐oxide‐impregnated paper strips may allow estimation of plant‐available P contents of soils with widely differing properties. Little information is available on the forms of P extracted by paper strips (SP). Relationships between SP and Olsen, Bray I, Mehlich III, and P fractions were investigated for 203 surface soils representing all soil orders. Soils were divided into calcareous, slightly weathered, and highly weathered groups, based on taxonomy and weathering. Amounts of P extracted by paper strips were closely correlated ( r 2 of 0.89 to 0.93, P > 0.001) with soil‐test P (Olsen, Bray I, and Mehlich III), for soils on which use of the test is recommended. It is suggested that the paper strips removed primarily physically bound extractable P from all soils (approximate 1:1 relationship), with little extraction of amorphous Al and Fe or Ca compounds indicated. A potential general applicability of Fe‐Al‐oxide‐impregnated paper strips to estimate plant‐available soil P is suggested.