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Gypsum Requirement & Exchangeable Sodium

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Alkaline soils are characterized by a low electrical conductivity (EC), high exchangeable sodium percentage (ESP) and presence of carbonate and bicarbonate sodium salts. High alkalinity hinders plant growth since it gives rise to an incomplete solubilization of necessary nutrients such as Iron, Copper and Manganese. Chlorosis, for instance, is a typical disease of leaves due to Iron deficiency. It is possible to correct soil alkalinity by adding a proper compound (generally gypsum) that removes Sodium and decreases the pH. The exact quantity of gypsum needed for correction can be calculated with the Hanna Instruments kit.

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