The look-up table LUT_EFFERVESCENCE from AusPlots Rangelands.
The amount of effervescence bubbles produce indicates the amount of carbonate in the soil. Effervescence is determined by dropping two to three drops of 1 molar Hydrochloric Acid onto an exposed area of soil.
White, A, Sparrow, B., Leitch, E., Foulkes, J., Flitton, R., Lowe, A.J., Caddy-Retalic, S. (2012). AusPlots Rangelands Survey Protocols Manual. Version 1.2.9 page 76. Terrestrial Ecosystem Research Network and The University of Adelaide Press. https://doi.org/10.25901/5f2ca309cc9c2
TERN is supported by the Australian Government through the National Collaborative Research Infrastructure Strategy, NCRIS.