Farming

Farming is a necessary gameplay element in Kingdoms and Castles. You must farm your land and see that it thrives. Farming can be done through farms and orchards. Farming generates for your peasants. Farming is vital early game

Efficient Farming
A Steam user by the name of Winter Waifu has written up an in depth guide with statistical analysis on efficient farming.

http://steamcommunity.com/sharedfiles/filedetails/?id=1092342277