18851

Updated: May 24, 2025

Wheat grown once in four years has been the only crop worth raising on the unfertilized land during the last twenty years, and even the wheat crop has distinctly decreased in yield; although where mineral plant food was applied the yield has increased from thirty bushels, in 18851 to thirty-eight bushels as an average of the last twenty years.

Cyril G. (Cyril George) Hopkins - The Story of the Soil; from the Basis of Absolute Science and Real Life,