The Crop Rotation mod introduces incentive for growing different crops rather than planting potatoes over and over again.
Changelog 2.5.0.0:
Fixed multiplayer sync issue
WARNING: crop history will be lost after upgrade on old saves
Changelog 2.1.0.3:
Crop Rotation planner added
Precision Farming DLC is not required anymore
Small update to yield factors (up to 5% difference)
Try yourself in reality, where nitrogen and lime are not the only nutrients that plants consume during their growth.
Gain up to 15% additional yield if done right.
Loose even more if you fail to take good care of the soil!
Key features:
Crop-specific return period to mitigate monoculture
Fallow support, up to two years (only with seasonal growth enabled)
Crop rotation info added to player HUD field information box
Detailed in-game help menu (with pictures!)
Crop rotation planner to visualize potential yield