Wow, I found this cool PDF of a document from 1917 which has calories yields per acre. It's incredible how much yields have increased in 100 years. It records

Wow, I found this cool PDF of a document from 1917 which has calories yields per acre. It's incredible how much yields have increased in 100 years. It records Pork at 672k calories per acre https://naldc.nal.usda.gov/download/ORC00000242/PDF https://naldc.nal.usda.gov/download/ORC00000242/PDF EDIT: Another great quote from the PDF "The soy bean.—Soy beans lead all other crops in the production of digestible protein, exceeding corn in this respect by almost exactly 100 per cent. This crop deserves more attention in this country than it has yet received. There is no reasonable possibility of overplanting it. "