Tilled Field
From Salem Wiki
Tilling a field
Fields are not built like other structures. Instead of placing the 'ghost' of a structure to indicate where to build it, you must select a tile.
The selected tile's North West corner will mark the center of the eventual 4x4 field. Tilled fields are easy to destroy if you misplace them.
Placing a theoretical field:
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| selected tile north = up | ||
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Hint: Currently there is no penalty to overlapping fields with other fields or structures, so long as you can access the center to "use" it.
For more information on farming, see Agriculture