"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." . "pHCaCl2 (soil reaction) in 1:1 soil/1 M CaCl2 solution (1 M)" . . "pHCaCl2_ratio1-1" . . . . "pHCaCl2_ratio1-1"@en . .