The oasis in this mod yield plenty of food. I was trying to play a "settle the Oasis" strategy with Nubia
Well, I meant just the initial population growth of Kerma ... you know, in the beginning of the 'snowballing', when the snowball is still tiny as a marble, when magic lies in every single action ...
In turn 5 he buys the floodplain to the south. I suggest to buy and work this floodplain immediately after the foundation of Kerma (simply because it is by far the best available tile).
After finishing the first unit, the builder, he improves 1) the double fooddeficient desertHillsIron [0F-3P-science], 2) the bought floodplain [4F-0P-0] (but not the grassland in between, so misses the bonus), 3) the adjacent fish [3F-0P-gold](would buy this fish much later, probably even after the goldmine), 4) the other fish [3F-0P-gold]
Σ = 10F-3P-1science-2gold
I would prefer to improve 1) the bought floodplain [5F-0P-0] , 2) the grassland in between [4F-0P-0], 3) & 4) both plains to the north of Kerma [3F-1P-0] & [3F-1P-0]
Σ = 15F-2P-0
This boosts already irrigation with the first builder. Kerma's holy site should be build on the "5 river-tiles" adjacent to the northern fish.
I'm uncertain: can much later, when Kerma no longer really needs this amount of food surplus, the "4 river-tiles" plainsFarm tile to the northwest (ie. 1st ring of Kerma) be used by maybe the 5th or 6th Nubian city as holy site?