Fertilizer in Medieval Dynasty: How to Make It

Numbers are from the game files (version 2.5.0.2); Steam's build is newer.

Manure: "Produced at the Pigsty or collected manually from other animal husbandry buildings. Can be used for crafting Fertiliser at the Workbench in the Barn." The tutorial adds that "Pigsty workers can be assigned to collect Manure and deliver it to the Resource Storage. Manure from other animal buildings needs to be collected manually by a player." The production files store these Manure rates:

Rot: "Created by food rotting over time. Can be used for crafting Fertiliser at the Workbench in the Barn." It has a poison value of 0.5 in the files, and the tutorial warns not to force people to eat it. 10 Rot make 1 Fertiliser, so Rot is the fallback for a store of spoiled food, not a plan.

Both recipes are crafted at the Workbench in the Barn ("Crafted from Manure or Rot at the Workbench in the Barn. Can be used for fertilising the fields using a Bag."). The Barn I costs 64 Stick, 27 Log, 12 Stone, 48 Straw and needs Farming technology level 10. Both recipes are 1 second with 0.4 Farming experience and no technology cost. A Barn worker produces 0.924 an hour of either in the production file.

The tutorial's field steps are: "1. Grub up the field with a Hoe. This only has to be done once, with every new field. 2. Sprinkle Fertiliser with the help of a Bag on the field. 3. Plough the soil using a Hoe. 4. Sow a desired seed selected from the Select Seed menu. 5. Harvest fully grown crops." A field is at most 16x16 tiles. You can also buy it: Farmer and Stallholder Resources vendors list it at a base price of 4 coins. The farming page has the crops and their seasons.