agriculture vs arboriculture

agriculture

noun
  • The art or science of cultivating the ground, including the harvesting of crops, and the rearing and management of livestock 

arboriculture

noun
  • The branch of horticulture concerned with the planting, growth, and maintenance of trees. 

How often have the words agriculture and arboriculture occurred in a corpus of books? (source: Google Ngram Viewer )