crofting vs cultivation

crofting

noun
  • A form of land tenure and small-scale food production, unique to the Highlands and islands of Scotland, in which individual crofts are established on the better land while a large area of poor-quality hill ground is shared by all the crofters of the township for grazing. 

  • The process of exposing linen to the sun, on the grass, in the process of bleaching. 

cultivation

noun
  • The art or act of cultivating; improvement of land for or by agriculture 

  • Advancement or refinement in physical, intellectual, or moral condition 

  • The state of being cultivated or used for agriculture 

  • Devotion of time or attention to the improvement of (something) 

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