"Extr_nh4-co3-2-ambic1"@en . . . "Leenaars J.G.B., A.J.M. van Oostrum and M. Ruiperez Gonzalez, 2014. Africa Soil Profiles Database, Version 1.2. A compilation of georeferenced and standardised legacy soil profile data for Sub-Saharan Africa (with dataset). ISRIC Report 2014/01. Africa Soil Information Service (AfSIS) project and ISRIC - World Soil Information, Wageningen, the Netherlands. See Annex 4." . . . . "Ambic1 method (ammonium bicarbonate) (South Africa). Particularly used for available P." . "Extr_nh4-co3-2-ambic1" .