Abstract
Effect of pH on phosphate adsorption by different soils was studied by varying the pH of supporting electrolytes NaCl and CaCl2. Variation in pH of NaCl did not markedly affect phosphate adsorption in all the soils. On the other hand, it decreased with pH from 4 to 6 and abruptly increased above pH 7.0 when CaCl2 was used as supporting electrolyte.