Skyrim is a vast province, but with only 13 miserable farms, it’s hardly capable of providing the people with everything they need.
The modification CACO Farm Overhaul for The Elder Scrolls V: Skyrim from modders Teabag86 and Kryptopyr updates all farms so that they can actually supply the local population. Also, the modification recycles the quest issued on farms.
Every farm specializes in something. For example, wheat farming, dairy farming, baking, livestock farming, small game hunting, apple orchards, local crops, and so on.
In the future, the modders plan to add a full-time farm work quest to the modification. You can download the modification from the link.