Develop County

Seizing settlements and adding settlements to land development sites in the direct control land will increase your gold income and harvest.
The daimyō can order this directly or allow a substitute to seize and add automatically.

*Seizing all settlements in a county will increase crops. Furthermore, seizing all settlements in a dominion (the domains under a castle) will increase commerce.

County Development Screen

Access Civil Affairs > Develop County from the command menu to develop a county.
Select the county you want to develop to bring up the county development screen.

Settlement

Farms and fairs will be seized at the daimyō's command. Select Farm or Fair and then select Confirm.
When the seizure is complete, the number will go up, and your gold income or harvest will increase accordingly.

Land Development

Settlements can be added to land development sites. Select the settlement you wish to add and then select Confirm.
These additions will increase gold income and harvest, and they will sometimes produce special results.

Depot	Halves provision consumption when marching through the county.
Fortress	Strengthens the county's defense. Occupation time for enemy units will increase and counter damage will be dealt.
Market	Increases the effect of fairs.
Commons	Increases the effect of farms.
Garden	Increases the honor gained by the land holder or substitute.

Major Settlement

When a certain number of settlements has been seized or added, you will receive a suggestion to add a major settlement via a Territorial Problem. Various effects can be gained through this addition.
The type of major settlement that can be added depends on the county.

*Suggestions will be made for large farms and large fairs depending on the number of settlements seized in a county, while other major settlements depend on the settlements seized and added throughout an entire dominion.
*In direct talks, requests will sometimes be made for a dominion where a major settlement can be added.

Trade Port	Increases commerce and enables the issuance of the Marine Transport policy.
Gold Mine	Increases commerce and enables the issuance of the Mining Technology policy.
Silver Mine	Increases commerce and enables the issuance of the Silver Trade policy.
Large Farm	Increases crops.
Large Fair	Increases commerce.
Horse Ranch	Increases cavalry LV.
Forge Town	Increases musket LV.
Temple	Increases commerce and enables the issuance of the Temple Donation policy.
Church	Increases commerce and enables the issuance of the Western Trade policy.
Onsen	Increases soldier restoration speed and enables the issuance of the Hot Spring Therapy policy.