From Egyptian Secrets of Albertus Magnus, Joseph H. Peterson edition:
To Sharpen Scythes for Mowing.
R. kitr., arvitr., romain erad, vitr., alb., [] r erad, of each for five cents, all pulverized, and some of it always kept nights in a dish put upon the grindstone, and sharpen therewith the scythe, and it will be in good condition for mowing.
The grimoire Egyptian Secrets of Albertus Magnus lists this spell.