NPK Fertilizer
This can be used in farming to speed-up the growth speed of your plants.
You will find in into crates, but it is a relatively rare item.
One PNK Fertilizer bag will enable you to fertilize only 4 parcels of your plantations.
Code
item Fertilizer { DisplayName = NPK Fertilizer, Icon = TZ_IndieStoneNPK, Type = Drainable, UseDelta = 0.25, UseWhileEquipped= false, Weight = 2.0 }