A person who practices or believes in the fallow system of leaving land unplanted to restore soil fertility.
From fallow + -ist (suffix meaning 'person who practices or believes in'). A relatively rare term from agricultural history referring to those who advocated for the fallow method.
Though you won't hear this word much today, fallowists of the medieval period were basically early soil scientists—they understood that dirt needed rest, decades before we understood nitrogen cycles and microbes.
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