This excerpt comes from the book "The Southern Gardener and Receipt Book" by Phineas Thornton published in 1839.
TO PREVENT CROWS FROM PULLING UP CORN
Soak seed corn in a solution of Glauber salts, from
twenty-four to forty-eight hours before planting and
no living animal, with the sense of taste will eat it.
This method of preventing crows from destroying
corn was accidentally discovered by John B. Swasey,
Esq., of Meredith, N. H., several years since. He
directed his hired man to soak a quantity of seed corn
preparatory to planting, in a solution of saltpetre.
BY mistake Glauber salts were taken for nitre ; the
mistake was not discovered, until it was nearly all
planted; the piece of ground was finished with dry
corn. The part of the piece planted with soaked
corn remained undisturbed ; while the dry corn was
nearly all destroyed by crows, blackbirds, and
squirrels. Page 269