Tiles without tile improvements provide very little compared to other Civ versions. Production will generally come from citizens/labourers in the city, so the emphasis on tile improvements is food production which will allow citizens to work in the city.
|Terrain||Food||Production||Commerce||Bonus Resources||Tile Improvements||Bonus Food Irrigated|
|Grasslands||0||0||0||Farm, Irrigation, Watermill (with River), Cottage||+2 (can be farmed w/o irrig.)|
|Plains||0||0||0||Farm, Irrigation, Watermill (with River), Cottage||+2|
|Grassland Hills||0||0||0||Terraced Farm, Irrigation, Windmill||+2|
|Plains Hills||0||0||0||Terraced Farm, Irrigation, Windmill||+2|
|Coast||0||0||0||with river: Estuary|