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Phosphorus Adsorption Maximum as Measured by the Langmuir Isotherm and Its Relationship to Phosphorus Availability
Author(s) -
Woodruff J. R.,
Kamprath E. J.
Publication year - 1965
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/sssaj1965.03615995002900020012x
Subject(s) - saturation (graph theory) , adsorption , soil water , langmuir adsorption model , chemistry , phosphorus , langmuir , sorption isotherm , langmuir equation , environmental chemistry , soil science , environmental science , mathematics , organic chemistry , combinatorics
The phosphorus adsorption maximum as calculated by the Langmuir isotherm was determined for a number of soils with a wide range in chemical properties. Neutralization of exchangeable aluminum markedly reduced the P adsorption maximum. The growth of millet was related to the degree of saturation of the P adsorption maximum. The soils with a large P adsorption maximum did not require as high a P saturation as those with a low adsorption maximum. Maximum yields on the limed soils were obtained when the equilibrium solution concentrations of P were greater than 0.1 × 10 ‐4 moles/liter of P. A much higher concentration of P was needed on the soils with a high saturation of exchangeable aluminum to give maximum yields, however, the yields were lower than on the limed soils.