What is the "seas fert" option for?

The seas fert (short for "Seasonal Fertilize") option in the farm plot building menu automates the fertilization process on that plot. Every season change, dwarves will attempt to automatically fertilize the farm plot with any available potash. If the amount of potash necessary to fertilize a crop of that size is not available, it will not be fertilized. It is also advisable to place a stockpile of potash near your fields to prevent your farmers from carrying across the entire map.

Fertilized crops produce better yields (larger stacks of plants), which leads to greater efficiency in most stages of post-processing (ex. plump helmet [5] -> dwarven wine [25], using only a single barrel).

Farming FAQ
How do I build a farm?
How large a farm do I need?
What is the best crop?
How do I manage my seeds and crops?
What does "Reserved Barrels" and "Reserved Bins" mean?
Why are crops sometimes displayed with red writing?
What do I do with these inedible crops?
What does the option "Fallow" mean?
My dwarves will only farm on a small part of the fields, why is this?
How do I make absolutely sure my farm plot is all set to produce crops?
If I don't see any dwarves working my farm plot, does that mean there's something wrong?
Can you grow surface crops on multiple z levels in a tower if the floors are glass even though there's soil on the glass?
What is the "seas fert" option for?
How do you create a custom stockpile that accepts only prepared foods?
How do you successfully breed and utilize animals(grazing, non-grazing and poultry)?
How often do you need to irrigate your farm fields?
Having banned seeds from the kitchen, how to prevent dwarves from eating them raw?
Why do my planters keep complaining they have no seeds?
Why won't my animals breed?
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