Roughly 25 square metres. That would make 1/4 of an Ancient Savo map tile. My total harvest of that area was somewhere around 3 - 4 kg. Based on this, one could expect a harvest of 3200 kg / hectare, which makes 32 kg for a 10m*10m map tile, 8 kg for 5m*5m area. So my harvest for this year was about 50% of the average yield with a selected breed, with modern farming methods. Hehe, personally I'm satisfied with the outcome, as I didn't put that much time or resources in preparing the soil or de-weeding.