Relationship between Phosphorus Sorption and Soil Acidity as Affected by Bicarbonate and Silicate Ions

The aim of this article was to establish a relationship between phosphorus (P) sorption and pH and phosphorus concentration of soil solution in the presence of specifically sorbed anions such as bicarbonate and silicate. Phosphorus sorption isotherms were obtained at different pH values of equilibra...

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Bibliographic Details
Published in:Communications in soil science and plant analysis 2007-03, Vol.38 (5-6), p.679-694
Main Authors: De, N, Datta, S.C
Format: Article
Language:English
Subjects:
Agronomy. Soil science and plant productions
Alfisol
Alfisols
bicarbonate
bicarbonates
Biological and medical sciences
chemical concentration
equations
Freundlich equation
Fundamental and applied biological sciences. Psychology
Inceptisol
Inceptisols
ions
phosphates
phosphorus
phosphorus sorption
silicate
silicates
soil chemical properties
soil chemistry
soil nutrients
soil pH
Soil science
solutions
sorption
sorption isotherms
Vertisol
Vertisols
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Summary:The aim of this article was to establish a relationship between phosphorus (P) sorption and pH and phosphorus concentration of soil solution in the presence of specifically sorbed anions such as bicarbonate and silicate. Phosphorus sorption isotherms were obtained at different pH values of equilibrated soil solutions for three surface soil samples, namely Typic Haplustept, Calcic Chromustert, and Ultic Paleustalf, in three different systems, namely bicarbonate (0.001 M), silicate (0.001 M), and a system without any bicarbonate and or silicate, all having a common concentration of 0.1 M sodium chloride (NaCl). Phosphate sorption data at different pH values could be fitted very closely to a modified Freundlich equation of the form X/m=K H(a) C(b), where, X/m is the amount of phosphate sorbed at solution phosphate concentration C and hydrogen ion concentration H. The values of a and b were positive fractions found to vary with soils and ionic medium. A silicate system more effectively reduced P sorption, particularly at lower pH values. The differences in P sorption in different media gradually decreased in all the soils as pH increased.
ISSN:0010-3624
1532-2416
DOI:10.1080/00103620701220403