Sketter Joe , who ask the question is in SC. I don't know what his situation is so "it depends " is good advice. For example we have 3 ponds within a mile and all 3 have different responses to the same mgt practices. I too have not seen a pond that was N limited but don�t doubt they exist. A good idea is to get the soil/water tested so you know the facts. The link I posted makes that clear.