How to Bury a Dead Body
I myself would bury the body deeper in order to protect it from animals digging it up often for their own food. A good rule of thumb is to dig a hole around 5 feet deep or more for that purpose.
After all, not everybody can get lime and lye to mask the aroma from a dead body, too.
Cremated remains are easier to deal with.
And last, keep a record by some means, like markers or a diagram, or both, of where the bodies are buried. Re-interment is a big deal to so many of those relatives and friends.