Walt it is not uncommon for people to take that type advice and fertilize without first testing (not knowing the limiting factor) resulting in a dense plankton bloom and a resulting DO crash. This kills many of their fish and sets back there program and costs them money needlessly. There are unfortunately a number of people on this forum who have done exactly that and suffered. I know none of us want to be responsible for that happening to someone.

Without knowing the specifics of the pond a blanket recommendation to fertilize is not good advice. That is what George was pointing out. That is what the archive provides. It quotes from the SRAC publications (TX A&M is a host). The second link in the archive to the MS Pond Manual is common. If you look at the chart in it you will see that an entire region of MS (the Delta - about 25% of the state) does not need fertilizer.