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Glossary:Exchangeable sodium percentage (ESP)
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The extent to which the adsorption complex of a soil is occupied by sodium. Amount of exchangeable sodium expressed as a percentage of total exchangeable cations. Refer to discussion under exchangeable cation percentage. It is ex pressed as follows: ESP= Exchangeable sodium (meq/1OOg soil) Cation exchange capac1.ty (meqI1OOg sol"I) x 100
