Exchangeable Ca, K, Mg, Na (and Mn)

by Inductively Coupled Plasma Optical Emission Spectrometer (ICP-OES)

Base cations are extracted by shaking 2 g of air dried soil in 20 mL of 1 M NH4OAc (pH 7) for 30 min. Extracts are centrifuged, and the supernatant is decanted and analyzed by ICP-OES.

(See Method References No. 30 & 21) 

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Soil Analysis