New class: exchangeable calcium content in soil

[celineaubert]

exchangeable calcium content in soil

• subclassOf content http://purl.obolibrary.org/obo/PATO_0000025
• subclassOf inheres in soil
• definition A composition entity inhering in soil by virtue of the soil's quantities of exchangeable calcium. Exchangeable calcium is readily available celcium, which plants can easily absorb. This fraction of calcium is held on the surface of clay particles and organic matter in soil. http://www.terragis.bees.unsw.edu.au/terraGIS_soil/sp_exchangeable_calcium.html

[marieALaporte]

Need to create:

exchangeable cation: A cation that is capable of being readily substituted from the soil solution and onto the surface of a negatively charged soil particle, and vice-a-versa. (cf. http://www.terragis.bees.unsw.edu.au/terraGIS_soil/sp_exchangeable_cations.html)

Then apply pattern to create the concentrations of different cations in soil:

concentration of exchangeable cation in soil: The concentration of exchangeable cation when measured in soil.

concentration of exchangeable calcium in soil: The concentration of exchangeable calcium when measured in soil. ...

@celineaubert and I are wondering if 'exchangeable cation' should belong to ENVO or not, as it is something relevant only to soil. If yes, where should it go in the hierarchy? under the Chebi term cation, which means that then the parent term won't be an ENVO term? @cmungall @pbuttigieg