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THE INFLUENCE OF CALCIUM CHLORIDE CONCENTRATION ON THE DETERMINATION OF LIME AND PHOSPHATE POTENTIALS OF SOIL
Author(s) -
LARSEN SIGURD
Publication year - 1965
Publication title -
journal of soil science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.244
H-Index - 111
eISSN - 1365-2389
pISSN - 0022-4588
DOI - 10.1111/j.1365-2389.1965.tb01438.x
Subject(s) - lime , phosphate , calcium , chemistry , soil water , chloride , environmental chemistry , molar concentration , inorganic chemistry , soil science , geology , metallurgy , materials science , biochemistry , organic chemistry
Summary Schofield's lime and phosphate potentials were determined on four soils using CaC1 2 solutions varying in strength from 0.002 to 0.05 M. The lime potential, pH–½pCa, was found to be independent of the CaCl 2 concentration. The phosphate potential, ½pCa+pH 2 PO 4 , of the neutral and alkaline soils decreased when the CaC1 2 molarity was increased from 0.002 to 0.05. When allowance was made for the formation of a soluble calcium phosphate complex, CaHPO 4 , the phosphate potential became independent of the calcium chloride concentration in all four soils.