The plan eventually is to change the way farming works, farming won't produce money but instead food, you will have farms yourself but there will be other farmland in your kingdom not owned by you that also produces food
All food produced on your farms is provided to your units first of all, the left over can be used a multitude of ways, you can trade or sell it, distribute it to the poor or do all of those, this will make crop events very interesting, of course as king you won't really bother much with these things as you will have a minister of agriculture who will automate the process for you mostly, though there will be crop failures which will result in food shortages, you will be able to buy granarys to store surplus food in preparation for those shortages, you may need to trade food from another kingdom, as each kingdom will produce and eat food each turn, adding a new element to the game, the ability to starve out a kingdom.
Kingdoms will each have their own food types as well as some basics that most or all kingdoms will have, these food items will replenish x points per item, some kingdom units will need to eat more than others, so for example snotlings will eat a tenth of what a minotaur will eat
You can trade with other kingdoms for food or sell it to them, kingdoms who are starving will pay more, witches curses can cause your crops to fail, starved people will die and you will lose public opinion, if things get really bad people can even become cannibals.
There are lots of ways this will be developed but this is all planned to be done alongside the economy update which is coming at some point, and will add more use of the currencies each kingdom uses, will add business and industry to the kingdom, will add mines giving you ore instead of gold, will add the marker and various other things and should make the game far more dynamic!