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The reason I don't think Dwarves were given to farming is because their halls were not well-aired, and were mostly cut off from sunlight. Plants need both fresh air and abundant sunlight to grow, and unless the Dwarves had UV lamps like those used in modern greenhouses it would not be possible to obtain a good crop underground. Plus I don't think the rocky, gravelly soil down there would be very fertile.
The only exception is mushrooms and other fungi, which grow well under such conditions inside dark caves.
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