agrology vs phytology

agrology

noun
  • The science and art of agriculture. 

  • 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. 

phytology

noun
  • the study of plants; botany 

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