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Composition of Dilute‐Acid‐Fluoride (Bray P1) Extracts of Illinois Soils
Author(s) -
Tandon H. L. S.,
Motto H. L.,
Kurtz L. T.
Publication year - 1967
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/sssaj1967.03615995003100020009x
Subject(s) - reagent , chemistry , soil water , phosphorus , extraction (chemistry) , fraction (chemistry) , composition (language) , fluoride , nuclear chemistry , environmental chemistry , mineralogy , chromatography , inorganic chemistry , geology , organic chemistry , soil science , linguistics , philosophy
The Bray P 1 reagent (0.03 N NH 4 F + 0.025 N HCl) is widely used to extract “available P” from soils, but few studies have been made to determine the other elements that it removes with P. Illinois soils differing in pH and P fertilization were extracted with the P 1 reagent and also separately with its two components, 0.025 N HCl and 0.03 N NH 4 F. These extracts were analyzed for P, Al, Fe, Ca, Mg, Mn, and Si. Phosphorus extracted by the P 1 reagent or by 0.03 N NH 4 F was not correlated with soil pH or any of the other elements extracted. Combinations of Al with P in the soil, if they existed, could have been masked since the Al extracted by P 1 and by 0.03 N NH 4 F were many times greater than the P extracted. Phosphorus removed by 0.025 N HCl was positively correlated with soil pH and with the Ca and Mg in the same extracts. From most soils the P 1 reagent removed more P than the sum removed separately by 0.03 N NH 4 F and 0.025 N HCl. However, the reverse was true for a soil naturally high in calcium. Removal of the “Al‐P” fraction of Chang and Jackson markedly reduced the P removed in a subsequent extraction with the P 1 reagent. Also, very little Al was extracted by P 1 after the “Al‐P” fraction had been removed.