Theres no easy answer as one has to consider several factors. Such factors are "quality of the earth", "type of plants", "weather", "personal skill" and many more. Even the best conditions can end in unsatisfying results if one of those factors is off. 
To give you an example; When you have don't have agriculturally usable earth, like in a desert, then you need a much larger area of land to get to the same outcome than when you have high quality earth available.
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