You can easily create a farm world that you do not have to destroy a main world!
World Create:
/farmworldcreate
farmworld.create
World Delete:
/deletefarmworld
op
FarmWorld Teleport:
/farmworld
farmworld.teleport
World Teleport:
/world
farmworld.teleport
Send a other Player in the Farmworld:
/transfer <Playername>
op
Config:
FarmWorld name change
Permissions deny message change
Permissions change