THE INFLUENCE OF CALCIUM CHLORIDE CONCENTRATION ON THE DETERMINATION OF LIME AND PHOSPHATE POTENTIALS OF SOIL

Publisher Website
Google Scholar
Abstract
Summary: Schofield's lime and phosphate potentials were determined on four soils using CaC12 solutions varying in strength from 0.002 to 0.05 M. The lime potential, pH–½pCa, was found to be independent of the CaCl2 concentration. The phosphate potential, ½pCa+pH2PO4, of the neutral and alkaline soils decreased when the CaC12 molarity was increased from 0.002 to 0.05. When allowance was made for the formation of a soluble calcium phosphate complex, CaHPO4, the phosphate potential became independent of the calcium chloride concentration in all four soils.