agrology vs arboriculture

agrology

noun
  • A subdiscipline of agronomy (the science of utilizing animals, plants, and soils) and of soil science which addresses the influence of edaphic (soil-related) conditions on crop production for optimizing it. 

  • The science and art of agriculture. 

arboriculture

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

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