https://w3id.org/framester/conceptnet5/data/en/irrigate_land <https://w3id.org/framester/conceptnet5/schema/IsA> <https://w3id.org/framester/conceptnet5/data/en/field> <https://w3id.org/framester/conceptnet5/data/en/unnatural_thing> <https://w3id.org/framester/conceptnet5/data/en/cultivable_land> risorse dalla linked data cloud