IIRC, +5 food and at least 8 shields will give you a settler farm producing every 4 turns (granary required), so irrigating the game is a no brainer if needed to reach that point.
I tend to mine all grassland early and then go back and irrigate later. Most plains get the water ditches early, but I often go back and mine some of that after Steam to get some extra shields. This gives a big boost when you have a factory and the Great Dam. Depends on how much pop you want in the city.
I tend to mine all grassland early and then go back and irrigate later. Most plains get the water ditches early, but I often go back and mine some of that after Steam to get some extra shields. This gives a big boost when you have a factory and the Great Dam. Depends on how much pop you want in the city.
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