Fertilizer
Fertilizer is a crafted liquid product used to restore 
Fertility in the Farm, Irrigated Farm, Greenhouse, and Greenhouse II. Along with the growing of 
Green Manure and natural replenishment, it is the only method of restoring Fertility levels. 
Fertilizer I and 
Fertilizer II also can get the fertility above 100%.
Fertilizer has to be supplied via a pipe, transport vehicles do not transport fertilizer. When different types of fertilizer is delivered to a growing plot, their properties will be mixed proportionally.
In the mid-game, Fertilizer I is generally produced using the the Ammonia byproduct from Sour Water stripping and Nitrogen from the 
Air Separator. It can be enhanced by adding Limestone and Sulfur to Fertilizer II. Alternatively, 
Fertilizer (Organic) can be sustainably produced through green methods using Compost.
