What is the most effective farm in Minecraft?

What is the most effective farm in Minecraft? A basic repeatable farm plot consists of a 9×9 square of farmland with the center square dug out and filled with a water source block. This gives 80 blocks of farmland which can be fenced with 40 pieces of fence including gates and is the most efficient arrangement for simple farms.

A basic repeatable farm plot consists of a 9×9 square of farmland with the center square dug out and filled with a water source block. This gives 80 blocks of farmland which can be fenced with 40 pieces of fence including gates and is the most efficient arrangement for simple farms.