Rich soil map location

Add a rich soil map location which allows you to construct farms, similarly to mines and oil rigs.
Higher levels would allow more advanced crops to be produced in addition to increasing max shifts.
While replicating the crop rotation interface like with normal island maps, having remote farms produce just one product of choice would probably be good enough.
This could also be an upgrade/replacement of groundwater wells, which are very lackluster in their current state.
If this were to be added into the game, it would:
* Create more options for producing large quantities of a single crop, making production chains like biofuel and biodiesel more viable,
* Make main island farming less crucial, lessening water consumption, and reducing the dominance of desalination mid-game.

Rich soil could simply increase of X% the production based on the quality of the soil, or just give a higher fertilized baseline on that farm.
Rich soil locations could be created dumping compost or, more realisticly, making a recipe Compost + Dirt in a Mixer to create Topsoil.
This could lead to a more vast solid fertilization tech production line.