AGROVOC Woody Plant Ontology Source
http://aims.fao.org/aos/agrovoc/c_5090 http://www.cropontology.org/rdf/CO_357:1000092 LOOM
http://aims.fao.org/aos/agrovoc/c_2862 http://www.cropontology.org/rdf/CO_357:Fertility LOOM