What is <research intervention> of <crop rotation> ?
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What is the research intervation of crop rotation?
SELECT DISTINCT ?k WHERE { ?k property:research_intervention resource:crop_rotation }
select distinct ?answer where { ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject>  ?answer. ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P4844> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q191258>. }
select distinct ?answer where { ?answer wdt:P4844 wd:Q191258}
Broadbalk long-term experiment Long-term rain fed experiment (D5)