So pulling from various sources in the Players Manual:
(the difference between them is that Domestic Food is "processed"/cooked and weighs half as much. But the takeaway here is that they both spoil in a week.)Page 131: Food and Drink
Domestic Food: ...needs to be consumed within a week, or it will spoil.
Wild Food: ...Spoils after one week.
Page 134: Cropland
For each <success> rolled (on your Stamina skill - Ed.) when you harvest in the fall, the field yields d6x100 units of wild food.
Root Cellar
Makes your domestic food stored here last for a month instead of just a week...
Page 148: Cooking
...your rations of meat, fish or wild food are turned into domestic food rations
So let's assume you have Cropland in your base, and you get two <success> on your Stamina check to harvest. Cool, you get 2d6x100 wild food - assume average so you now have 700 wild food. Awesome!
You spend the next while converting it to domestic food, to store in your Root Cellar (aside: how much wild food can you convert in a single shift? The book says "at a campfire" you can only do 12 at a time, but in a kitchen... it doesn't say. It must be more than twelve, but I don't think it'd be 700 /aside)
So now you have 700 domestic rations....that will spoil in a month. What are you supposed to do the other 10.5 months of the year? You're only allowed to harvest once and only in the fall, and (by the book) there's no other way to store food for longer.
Am I missing something?
To be clear: I'm looking for an official, RAW answer, if there is one. I'm aware I can wing it, but that's not the point of this post.