Maybe the people who are seriously considering a one-way colonizing trip to Mars have thought this through, but I don't think that regular folks have any idea how much space is necessary for food production per person. How big of a garden do you need to feed yourself? How long between planting and harvest? Remember... you can't go to the store if you run short. Greenhouses and hydroponics are well established and understood and I'm sure that the production rate information is out there. Remember... you can't just order another tanker load of hydroponic nutrient mix. I looked around and found this... "1 square foot will yield roughly .112 lbs of winter wheat or .107 lbs of spring wheat. For 4 cups of flour you would need to plant roughly 9 square feet." For sake of argument, assume that using hydroponics the per foot yield is doubled. So 9 square feet will get 8 cups of flour... in about three months. Or somewhere between 4 cups and 8 cups. A
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