Plant Experimental Conditions Ontology	Material Rock	Source
http://sweet.jpl.nasa.gov/2.3/matr.owl#Mixture	http://purl.obolibrary.org/obo/CHEBI_60004	LOOM
http://sweet.jpl.nasa.gov/2.3/matrRock.owl#Rock	http://purl.obolibrary.org/obo/ENVO_00001995	LOOM