Lime and Phosphate Potentials of Soils

Soils of Nadia are mostly calcareous in nature. The phosphate potential-lime potential (measured in 0.01 M CaCl₂) diagram shows that the phosphates of these soils are intermediate in composition between octacalcium phosphate and hydroxy apatite. This suggests the presence of these two forms in these soils in different proportions. pH measurements at different soil solution ratios show that although pH of the suspension varies with dilution, the lime potential remains more or less constant.