Fertilizer

You can produce fertilizer from sewage, which will provide a fertility boost for just under a year when placed on growable terrain.

First you must research Sewage Sludge Composting, then you can collect sewage from septic tanks by setting the percentage threshold for when it should be emptied by a hauler, or by using the remove sewage designator to extract sewage deposited by sewage outlets on the ground.

Like irrigation it should stack with any modded terrain types, use the mod options to adjust the strength to your liking.