Economic and Environmental Geology

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Table. 1.

Table. 1.

Analytical methods for soil fertility indicators in soils

Indicator Pretreatment (extraction) Analysis
Major pH/EC Distilled water pH/EC meter
CEC Sodium acetate method ICP-OES
Ex. cation (Na+, K+, Ca2+, Mg2+) 1M ammonium acetate method ICP-OES
Soil organic matter (SOM) Tyurin method Titration
Total-N (T-N) Kjeldahl method Titration
NO3-N/NH4-N 2M KCl extraction Colorimeter
Total-P (T-P) HClO4 digestion and Mo colorimetry UV-vis spectrophotometer
Available-P (Av. P (Av. P2O5)) Lancaster method UV-vis spectrophotometer
Total-S (T-S) HNO3+HClO4 extraction ICP-OES
Available-S (Av. S (SO4)) Ca(H2PO4)2 extraction IC
Auxiliary Available-B (Av. B) Hot water extraction ICP- OES
Trace element (Fe, Mn, Zn, Cu, Ni, etc) Aqua regia extraction ICP- OES
Econ. Environ. Geol. 2021;54:409-25 https://doi.org/10.9719/EEG.2021.54.4.409
© 2021 Econ. Environ. Geol.