Historically, at least since the mechanization of agriculture began in earnest, there have been two primary measures of agricultural productivity, the amount that could be grown on a given acreage and...
Your typical farm raises at most a few crops, frequently only one. Because it's what I know, and because it's in practically every processed food you can buy, let's take wheat as an example.
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One measure by which conventional agriculture likes to judge itself, the output per man hour, or, put another way, the percentage of the population directly engaged in crop production, is seriously mi...