What dung heaps should you peruse?

a dung heap is a great big pile of poo

Only cover the pile when you don't want animals to eat the compost. Otherwise leave it uncovered to help the bacteria to compost the matter and ensure moisture gets in the pile.-Super Llama

You either turn them over so they compost or you let them grow and use them. It is better to remove potatoes from your compost heap turning them over will make no difference.

Depends on the sentence. It does depend but on it's own would be shouldn't have.

You should use "should have" instead of "should of". "Should of" is just the lazy man's term for "should have" because people were to lazy to say the entire phrase. People tried to say "should have"...