Concept information
PREFERRED TERM
axAlcalic
TYPE
-
http://stats-class.fao.uniroma2.it/ontologies/WRB#qualifier
DEFINITION
- (from Arabic al-qali, salt-containing ash): having: • a pH (1:1 in water) of ≥ 8.5 throughout within ≤ 50 cm of the mineral soil surface, or to continuous rock, technic hard material or a cemented or indurated layer, whichever is shallower, and • an effective base saturation [exchangeable(Ca + Mg + K + Na) / exchangeable(Ca + Mg + K + Na + Al); exchangeable bases by 1 M NH4OAc (pH 7), exchangeable Al by 1 M KCl (unbuffered)] of ≥ 50%: * in the major part between 20 and 100 cm from the mineral soil surface or * in the major part between 20 cm and continuous rock, technic hard material or a cemented or indurated layer starting > 25 cm from the mineral soil surface, or * in a layer ≥ 5 cm thick, directly above continuous rock, technic hard material or a cemented or indurated layer starting ≤ 25 cm from the mineral soil surface. (en)
URI
http://stats-class.fao.uniroma2.it/WRB/v2014/Alcalic
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