What does the difference between pH in water and pH in cacl2 and relationship between soil pH measurements in calcium chloride and water suspensions?
Buffer capacity is measured a different way, but the difference between pH in water and CaCl2 gives you an indication of buffer capacity. However, the pH difference between measurements in water and CaCl2 is related to the soil solution electrolyte concentration. We observed that the pH difference between the two methods became smaller with increasing soil electrical conductivity (EC). The relationship between the pH in a 1:5 soil water suspension and the pH in 0.01 M CaC12 has always been considered to be linear, but recent findings favor a non-linear relationship. So, the solubility of CaCl2andMgCl2 C a C l 2 a n d M g C l 2 is unaffected by the change in the pH since they are neutral salt. Lower the pH, higher will be the solubility of the sparingly soluble base or basic salt and vice-versa.
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