The N
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Political Franchise
Early farming yields on Earth were on the order of 5:1 to as low as 2:1, depending upon the weather and luck. That is 5 units would be produced for every unit of grain planted, of which one unit of the harvest had to be saved for next years planting. This was typical of the Mediterranean and Europe up through the early middle ages. This is the type of agriculture that was brought to Oceana by the Legion. The Greeks and Egyptians brought similar agricultural technology with them to Oceana. This relatively low crop yield kept population growth down over the next few hundred years. Population growth was also limited by an on going war with the Kobolds during the second century on Oceana.
It wasn't until the late middle ages that the introduction of legumes (peas and clover) permitted much higher yields thru better crop rotation and soil treatment.