Hm, Crop Rotation Benefits aren't in yet, are they?
I don't think so, but because it's so trivial to set up rotations already, there's no reason not to -- for underground farms the only year-round crop is plump helmet, and who wants a fort full of those? I generally end up doing a field of "bag crops" and a field of "barrel crops", with each field getting harvested to a different processing area. If you rotate your bag crops sensibly you can have cloth, flour, and dye production running year-round.
Bag Crops - Pig Tails become bags, everything else becomes a bagged food (flour or leaves) or dye
- Quarry Bush
- Cave Wheat
- Pig Tail (or Cave Wheat)
- Dimple Cups
Barrel Crops - process into syrup or booze
- Sweet Pod
- Sweet Pod
- Plump Helmet (or Pig Tail)
- Plump Helmet
Surface Farm Bag Crops - process into cloth for bags, or flour or dye
- Rope Reed (two seasons out of phase with Pig Tail production)
- Blade Weed or Sliver Barb (two seasons out of phase with Dimple Cups)
- Whip Vine
- Longland Grass
If you use the manager to queue the same number of milling, weaving, and dyeing jobs each season, then you can queue booze jobs in the off-season to take advantage of any overage.
- Spring - Queue up Mill Plant jobs to grind Longland Grass to flour and Dimple Cups to dye. Ensure that your dimple cups are closer to the mill than your Longland Grass, and set your job queue to 75% - 80% of the total winter harvest. Queue up Make Cloth Bag to turn Pig Tails into spare bags.
- Summer - queue Process Plant jobs to turn Rope Reed to thread, and Process Plant to Bag jobs for the QBLs. Set the first to 90% of your harvest and the second to 100% of harvest.
- Fall - queue Make Cloth Bag jobs, Prepare Lavish Meal jobs, and Mill Plants jobs.
- Winter - Process Plant (for Pig Tails) and Mill Plant (for dyes). Queue up Brew Drink (30) several times or just put a repeating job in your still in order to use up the year's overage.
Each season you're either making bags, filling bags, or both.
...yes, I maybe answered a little more than you asked.