You can not grow those delicious potatoes forever on the same piece of Land
I suggest something like a "soil fertility bar" or another way to highlight soil fertility. Growing crops will reduce fertility over time. Different Crops have different fertility requirements: However, there could be different ways for restoring fertility:
- Grow a different Crop on the field, a technique called crop rotation (different crops need different nutrients) This would slowly restore fertility
- Pick up Manure from the Coops and Pastures and bring it on the field. Farmers would from time to time (similar to watering, but less frequent) visit coops to get organic fertilizer.
Another Idea:, There could be similar to mining values for fertility of the soil to begin with (green, yellow, red) which if for example red, first need to be fertilized after the field is set up before growing is possible. On green areas there is high fertility