Soil pH And Redox Potential

Soil pH, which is a measure of the acidity or alkalinity, and redox potential, a measure of the aeration status, are the two crucial factors that control many of the chemical and biological processes in soil. 

If soil pH is increased (H in solution decreased), the equilibrium shifts to the right some non-exchangeable acidity released. If soil pH is 

Worked example 5.3 — soil buffering and liming To raise the pH of 5 g of the soil in Worked example 5.1 to 6.5, required addition of 4 cm of 0.005 mol Ca(OH)2 solution. How much calcium carbonate would be required to be added to 1 ha (Mol wt CaCOs = 100). 

From Worked example 5.1, there are 2500 t ha in the top 20 cm, which approximates to rooting depth. 

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