[rickboyce]

In parts of the world and acre certainly could be a very productive farm.

An example in North America - "With only 1½ acres cultivated in permanent beds, the farm grosses more than 100 000$ per acre with operating margins of about 60 per cent, enough to financially sustain his family." http://www.themarketgardener.com/

[dsp1234]

You missed the line right above that:

"an internationally recognized 10-acre micro-farm"

Even 10 acres is considered "micro". Also, that's 1.5 acres of cultivated permanent beds on 10 acres.

For a 1 acre farm, where are the homestead, barns, equipment(tractors, tillers, etc), animals, etc located? All of that takes up space, which can't be used for growing. You need more than a single acre to actually have an acre of growing area.

[randomdata]

As a grain farmer, one of the farms I work is only 3 acres. The answer to your question is simple: You keep them at another farm.