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By your estimation, you can grow the above listed bushels of grain on 100' x 100' ? That surprises me! ...
Your figures give me hope I could maybe branch into some grain to supplement and learn more.
I don't trust any of my math!
But I think I got it pretty close this time. Edit to add, pretty close given that I don't have any shortage of space, don't care if there is extra, and don't have much experience.
I dug out my book "Small-Scale Grain Raising" by Gene Logsdon
He says the space to grow 1 bushel is:
Field corn, 10' x 50'
Sweet corn, 10' x 80'
Popcorn, 10' x 80' (regular ears; not necessarily strawberry type varieties)
Oats, 10' x 62'
Barley, 10' x 87'
Rye, 10' x 145'
Buckwheat, 10' x 130'
Grain sorghum, 10' x 60'
Wheat, 10' x 109'
He says these are just ballpark figures. Weather, variety, knowhow make a lot of difference. A really good wheat grower with a little luck can get a bushel from a plot half that size.
He also covers how much grain a family might use for cooking and sprouting in a year:
Wheat, 4 pecks (1 bushel)
Corn, 2 pecks
Popcorn, 2 pecks
Soybeans, 4 pecks
Grain sorghum, 2 pecks
Buckwheat, 1 peck
Oats, 1 peck
Triticale or rye or barley, 1 peck
Navy (or other soup bean), 2 pecks
Alfalfa (for sprouting), 1 or 2 quarts
Lentils, field peas, cane sorghum, ??
This can be expected to take 1/6 of an acre. For all of them. That is, all of the pecks a family could expect to eat (not the one bushel of each kind given before that).
Obviously, families vary in size and tastes. Mine is quite a lot different in the mix used, although probably not much different in total amount. A cup of grain makes about a cup of flour, if someone wanted to figure how much they use by how much whole grain, rolled or cracked grain, and flour they use.
Also, he gives how much grain various animals can be expected to eat in a year. He says one bushel per hen but doesn't give recipies or say anything about what they might be eating besides the grains.
Other parts of the book cover things like growing, harvesting, and processing (winnowing, hulling, and such).
It really is quite doable. My sister grows 10x10 or 10x20 plots of several kinds of grains in her garden. I might have the size wrong but quite small.